TMJ Dysfunction

Temporomandibular joint dysfunction is one of the few conditions VA rates not under the big musculoskeletal schedule in § 4.71a but under the dental and oral schedule in 38 CFR § 4.150, diagnostic code 9905. That detail matters, because the rating logic is different from a knee or a shoulder. There's no goniometer-and-degrees-of-flexion table here. The examiner measures how far your mouth opens in millimeters, how far the jaw slides side to side, and then asks a question most range-of-motion codes never ask: what can you actually eat.

The diet question is the part most veterans don't see coming. DC 9905 was amended effective February 17, 2017, and the current version builds the rating on three combined inputs: interincisal range of motion (the gap between your upper and lower front teeth at maximum opening, in millimeters), lateral excursion (the side-to-side range), and whether the condition forces a dietary restriction to mechanically altered, soft, or liquid foods. The evaluation climbs as the opening gets smaller, as the diet gets more restricted, and as more than one anatomical area is involved. The most restricted openings combined with a liquid-only diet reach the top of the code, up to 50 percent.

This page walks through how DC 9905 is structured after the 2017 amendment, the three levers that drive the rating, what the C&P examiner is required to measure, the secondary chains that run through TMJ (bruxism from service-connected PTSD, in-service dental and facial trauma, headaches arising from the jaw dysfunction), and the evidence gaps I see across the Board decisions. One number to set the stage: in Claim Raven's analysis of 499 BVA TMJ cases, 47.5 percent of the cases with a C&P adequacy determination had the exam flagged as inadequate. That is the single most important fact about how these claims go wrong.

TL;DR

• TMJ dysfunction is rated under 38 CFR § 4.150, diagnostic code 9905 (temporomandibular disorder), not under the § 4.71a musculoskeletal schedule.
• DC 9905 was amended effective February 17, 2017. The current version rates on a combination of three things: interincisal range of motion in millimeters, lateral excursion range, and whether the condition requires a dietary restriction.
• The lower your maximum mouth-opening (interincisal distance) in millimeters, the higher the rating. The most restricted openings combined with a liquid-only diet reach the top of the code, up to 50 percent.
• Diet is a real rating lever. The evaluation increases as the diet moves from mechanically altered foods, to soft foods, to liquid only, and as more than one anatomical area is involved.
• Lateral excursion limited to 0 to 4 millimeters warrants a 10 percent evaluation under the current code.
• The exact millimeter-to-percent thresholds live in the regulation itself. Read the current text of DC 9905 before relying on any specific number, because the 2017 amendment changed the structure.
• Common secondary chains run under 38 CFR § 3.310: TMJ secondary to bruxism driven by service-connected PTSD or anxiety, TMJ secondary to in-service dental or facial trauma, and headaches or migraines arising secondary to TMJ.
• In Claim Raven's analysis of 499 BVA TMJ cases, 21.4 percent were granted, 27.3 percent were remanded, and 51.3 percent were denied. Of the 406 cases with a C&P adequacy determination, 47.5 percent had the exam flagged as inadequate.

DC 9905 After the 2017 Amendment

The first thing to understand is that the version of DC 9905 you may have seen in an older decision or an old forum post is probably the pre-2017 code. The amendment effective February 17, 2017 rebuilt how the code works.

The current DC 9905 rates temporomandibular disorder on a combination of three measured or documented inputs:

Interincisal range of motion (the maximum vertical opening between the upper and lower incisors, measured in millimeters). Range of lateral excursion (the side-to-side movement of the jaw, measured in millimeters). Dietary restriction, meaning whether the condition requires the veteran to eat mechanically altered, soft, or liquid foods.

The evaluation rises as the interincisal opening gets smaller, as the diet becomes more restricted, and as more than one anatomical area is involved. The most restricted mouth-opening combined with a liquid-only diet sits at the top of the code, up to 50 percent. Lateral excursion limited to 0 to 4 millimeters warrants a 10 percent evaluation.

I'm being deliberately careful here about the exact millimeter cutoffs for the higher tiers. The brief and the regulation are clear on the structure and on the two anchor points I just stated (the 50 percent ceiling and the 10 percent lateral-excursion tier), but the precise interincisal-millimeter-to-percentage thresholds for the intermediate tiers are something you should read directly in the current text of DC 9905 at § 4.150 rather than trust from memory or from a secondhand summary. The 2017 amendment is exactly the kind of change that makes old numbers wrong. When you or your representative argue a tier, quote the current regulation.

The practical takeaway is the same regardless of the exact cutoffs: smaller opening, more restricted diet, more anatomical areas involved, higher rating. That is the rating engine.

The Three Levers That Drive a TMJ Rating

Most range-of-motion codes have one lever: degrees. DC 9905 has three, and they interact. Understanding each one tells you what evidence to build.

Lever one: interincisal opening (in millimeters). This is the headline measurement. The examiner has the veteran open as wide as possible and measures the vertical gap between the upper and lower front teeth (incisors) with a millimeter rule or caliper. Normal opening is generally in the 40-millimeter-and-up range. The more limited the opening, the higher the rating, up to the 50 percent ceiling when combined with the worst diet restriction. If the C&P report doesn't contain a measured interincisal distance in millimeters, the rater is missing the primary input.

Lever two: lateral excursion (in millimeters). This is the side-to-side slide of the lower jaw. The current code provides that lateral excursion limited to 0 to 4 millimeters warrants a 10 percent evaluation. It is its own measurement and its own pathway to a compensable rating, distinct from the vertical opening. An exam that measures only vertical opening and skips lateral excursion has left a measurement out.

Lever three: dietary restriction. This is the lever veterans miss most often, and it is built into the code. The evaluation increases as the diet becomes more restricted: from mechanically altered foods (cut small, ground), to soft foods, to liquid only. A veteran who can no longer chew steak or crusty bread and has shifted to soft or pureed food is describing a rating fact, not just a quality-of-life complaint. The diet restriction has to be documented, ideally in the veteran's own words to the examiner and in treatment notes, so it isn't lost.

The "more than one anatomical area is involved" language is the fourth dimension. Bilateral joint involvement, or involvement that extends beyond a single area, pushes the evaluation up. A veteran with both temporomandibular joints affected is in a different posture than one with a single joint.

These levers combine. The top of the code is not reached by mouth-opening alone or diet alone. It is the worst opening plus the liquid-only diet plus multiple areas. Build the record on all three.

C&P Exam Mechanics: What the Examiner Has to Measure

The TMJ C&P exam follows the DBQ for dental and oral conditions. Because the rating is built on specific measured inputs, the exam either captures them or it doesn't, and the inadequacy rate in the dataset says it often doesn't.

The examiner is required to measure and record:

• Interincisal distance at maximum opening, in millimeters, with the appropriate instrument (a millimeter ruler or caliper). This is the central measurement.
• Range of lateral excursion, in millimeters, to each side.
• Any dietary restriction, and to what level (mechanically altered, soft, or liquid).
• Pain on motion of the jaw, including where in the opening arc the pain begins.
• Clicking, popping, and locking of the joint, and whether the joint locks open or closed.

Pain, clicking, and locking should be recorded even though the rating is anchored on the measurements, because they support the functional picture and the diet restriction. A joint that locks closed mid-meal is the mechanism behind a soft-food diet.

When all of this is in the report, the rater has what the code needs. When it's sparse, the rater defaults to whatever is documented, which is usually less than the full picture. The cases that come back inadequate in the dataset, and that share is high, tend to be missing one of the core inputs: no millimeter measurement of interincisal opening, no lateral-excursion measurement, or no notation of dietary restriction at all. Each missing input is a tier the rater can't reach.

Secondary Chains: How TMJ Connects to Service

A meaningful share of TMJ claims are not direct service-connection claims at all. They are secondary claims under 38 CFR § 3.310, which allows service connection for a condition caused by, or aggravated by (Allen v. Brown), a service-connected condition. Three chains show up repeatedly.

TMJ secondary to bruxism driven by service-connected PTSD or anxiety. This is the chain that surprises people. A veteran with service-connected PTSD or anxiety grinds and clenches the teeth (bruxism), often at night, as a manifestation of hyperarousal and chronic muscle tension. Over years, that loading damages the temporomandibular joint and produces dysfunction. The nexus opinion has to connect the dots: the mental health condition drives the bruxism, the bruxism overloads the joint, the joint develops dysfunction. When the chain is documented, including a dental or sleep note describing bruxism and worn dentition, this is a recognized secondary pathway.

TMJ secondary to in-service dental or facial trauma. A blow to the jaw, a facial fracture, a dental injury, or surgery in service can set up TMJ dysfunction that surfaces or worsens later. Here the work is establishing the in-service event (STRs, line-of-duty records, buddy statements about the incident) and a medical opinion tying the current joint dysfunction to that trauma rather than to ordinary aging or a post-service event.

Headaches or migraines arising secondary to TMJ. This chain runs the other direction. The jaw dysfunction is the cause, and the headache is the secondary condition. TMJ-driven headaches and migraines are a recognized secondary when a medical opinion connects the muscular and joint dysfunction to the headache pattern. This one matters for the combined rating, because migraines have their own rating code and can carry a substantial evaluation of their own on top of the TMJ rating. A veteran who only claims the jaw may be leaving the headache rating on the table.

For all three chains, the standard for the nexus opinion is the same. A bare "more likely than not related" conclusion without reasoning is not probative. The opinion has to identify the mechanism, address the time course, and account for alternative causes. A fully articulated opinion based on sound reasoning carries the claim. A generic one does not.

Pain, Flare-Ups, and Functional Loss

Even though DC 9905 is built on measurements rather than a pure degrees table, the functional-loss principles still apply to the joint motion. DeLuca v. Brown (1995) holds that range-of-motion ratings must account for additional functional loss due to pain, weakness, fatigability, or incoordination, not just the static measurement on the day of the exam. Sharp v. Shulkin (2017) requires the examiner to estimate the additional functional loss during a flare-up when the veteran reports flares, or to explain why an estimate isn't feasible.

For a jaw, this plays out in a recognizable way. The interincisal opening measured in a quiet clinic on a good day might be wider than what the veteran can manage during a flare, when the joint is inflamed, locking, or in spasm. If the veteran reports that on bad days the mouth barely opens and meals become liquid, that flare presentation is supposed to be part of the analysis, not waved off because the in-clinic number looked better.

Saunders v. Wilkie (2018) is also worth knowing here. Pain that produces functional impairment can itself be a disability for VA purposes. For TMJ, where chronic pain on chewing and talking is the daily reality for many veterans, that principle supports putting the pain, and what it stops the veteran from doing, squarely in the record.

The evidence that supports a flare analysis comes from the veteran. A symptom log noting how wide the jaw opened on bad days, which foods had to be dropped, how often the joint locked in a month, and photographs or notes about swelling, all give the examiner facts to record and the rater something to weigh beyond the single-day snapshot.

Common Evidence Gaps in TMJ Claims

A few patterns I see across BVA decisions involving TMJ. These are qualitative reads from the cases, not separate computed statistics.

No millimeter measurement of interincisal opening. The single most damaging gap. The rating code is built on the interincisal distance in millimeters, and an exam that says "limited jaw opening" without a measured number gives the rater nothing to map onto a tier. This is the kind of omission that produces an inadequate-exam finding and a remand. With nearly half of the adjudicated TMJ exams in the dataset flagged as inadequate, missing or vague measurements are a recurring theme.

Diet restriction never documented. Diet is a built-in lever, and it is the one most often missing from the record. A veteran who has quietly switched to soft food for years may never have said so to a provider, so it never made the chart. Without the diet documentation, an entire dimension of the code is invisible to the rater.

Lateral excursion skipped. Vertical opening gets measured, side-to-side motion does not. Because lateral excursion is its own pathway (limited to 0 to 4 millimeters warrants 10 percent), skipping it can cost a compensable finding.

Secondary nexus opinion is conclusory. For the bruxism-from-PTSD and the trauma chains, decisions turn on the quality of the medical opinion. "TMJ is related to service" with no mechanism, no time course, and no discussion of bruxism or the in-service event reads as non-probative, and the claim stalls or gets denied.

The headache secondary never gets claimed. Veterans claim the jaw and stop. The TMJ-driven headache or migraine, which can carry its own rating, never enters the picture, so the combined rating is lower than the full disability picture would support.

What I can say from Claim Raven's analysis of 499 BVA TMJ cases is that 51.3 percent were denied and 27.3 percent were remanded, with grants at 21.4 percent. Of the 406 cases that had a C&P adequacy determination, 47.5 percent had the exam flagged as inadequate. That denial-heavy, inadequate-exam-heavy pattern is consistent with the gaps above: when the central measurements and the diet restriction aren't in the record, the Board either can't grant or has to send the case back for a better exam.

What to Ask the C&P Examiner to Capture

Because DC 9905 is measurement-driven, the exam is the rating engine, even more so than in a typical orthopedic claim. Before the exam, it helps to know exactly what has to be on the page.

The exam should include the interincisal opening measured in millimeters with a ruler or caliper, lateral excursion measured in millimeters to each side, a clear notation of any dietary restriction and its level (mechanically altered, soft, or liquid), pain on jaw motion and where in the arc it begins, and documentation of clicking, popping, and locking. If the veteran has flare-ups, the examiner should estimate the additional loss during a flare under Sharp, or explain why an estimate isn't feasible.

If the examiner skips the millimeter measurement, the rating has no anchor. If lateral excursion is skipped, a compensable pathway is lost. If the diet restriction is never asked about, a built-in lever disappears. Use C&P exam prep for the dental and oral DBQ and track jaw symptoms, locking, and which foods you've had to drop before the exam. A log with dates, how wide the jaw opened on bad days, foods dropped, and locking episodes gives the examiner facts to record and the rater facts to weigh.

Building the Diet-Restriction Record

The diet lever deserves its own attention because it is both important to the rating and easy to leave undocumented. The code increases the evaluation as the diet moves from mechanically altered, to soft, to liquid. That progression is a factual ladder, and each rung needs to be on paper.

The cleanest record states the diet level in concrete terms: which foods can no longer be eaten, what the veteran has switched to, when the switch happened, and why (pain on chewing, the joint locking mid-meal, the opening too small for normal bites). A treating dentist's or physician's note capturing this is strong. The veteran's own statement to the C&P examiner, recorded in the report, matters too. A symptom and diet log carried into the exam keeps the diet history from being summarized away as "no significant complaints."

The "more than one anatomical area" language is the companion point. Bilateral joint involvement should be documented as bilateral, not blurred into a single-joint description, because multiple-area involvement pushes the evaluation higher under the current code.

The Bruxism-From-PTSD Secondary: Why It Wins and Loses

This secondary chain is worth a closer look because it is both common and often poorly developed. A veteran with service-connected PTSD or anxiety clenches and grinds, the grinding loads and damages the joint, and TMJ dysfunction follows.

It wins when the nexus opinion explains the mechanism end to end: the mental health condition produces chronic hyperarousal and muscle tension, that drives bruxism (ideally corroborated by a dental note describing worn or fractured dentition, a night guard, or the veteran's reported grinding), the bruxism overloads the temporomandibular joint, and the joint develops dysfunction. The opinion should address the time course and rule out unrelated causes.

It loses when the opinion skips that reasoning. "TMJ is secondary to PTSD" with nothing in between is not enough. A rater or Board member needs the pathway. The aggravation theory under Allen v. Brown is also available: even if the TMJ has another origin, a service-connected mental health condition that worsens it through bruxism can support secondary service connection for the increment of aggravation. The secondary conditions tool can help map the chain before you file.

Bottom Line

TMJ dysfunction is rated under § 4.150 DC 9905, on the dental and oral schedule rather than the musculoskeletal one, and the 2017 amendment built the rating on three combined inputs: how far your mouth opens in millimeters, how far the jaw slides side to side, and how restricted your diet has become, with the evaluation climbing toward a 50 percent ceiling as the opening shrinks, the diet narrows to liquid, and more than one area is involved. The exact intermediate millimeter thresholds are in the current regulation, so quote it rather than an old summary. The recurring failure point, and the reason nearly half of these C&P exams in the dataset come back inadequate, is a thin exam: no measured interincisal distance, no lateral excursion, no diet documentation. The cases that succeed tend to have all three captured, a clear diet history, and, where it applies, a fully reasoned secondary nexus opinion tying the jaw to service-connected PTSD-driven bruxism or to in-service trauma, plus a claim for the TMJ-driven headache that is often left off entirely. Same condition, different paper trail, different outcome.

Related Conditions

TMJ claims commonly connect to migraines (the most common downstream secondary), tbi (where facial trauma and head injury overlap), ptsd, and anxiety (the mental health conditions that drive the bruxism pathway). Because the headache and the mental health pieces can carry their own ratings, veterans with jaw dysfunction should review the secondary conditions tool before assuming a single TMJ rating tells the whole story.

Methodology and Limitations

• Data source: Rating criteria from 38 CFR § 4.150, diagnostic code 9905 (temporomandibular disorder), as amended effective February 17, 2017. Secondary service connection from 38 CFR § 3.310. Case law from DeLuca v. Brown (functional loss), Sharp v. Shulkin (flare-up estimates), Allen v. Brown (secondary aggravation), and Saunders v. Wilkie (pain as disability).
• Sample size: Patterns in this post are drawn from Claim Raven's analysis of 101,518 condition records drawn from the analyzed subset of Claim Raven's 501,000+ Board-decision library, including 499 temporomandibular (TMJ) cases. Within that subset, outcomes ran 21.4 percent granted, 27.3 percent remanded, and 51.3 percent denied. Of the 406 cases that had a C&P adequacy determination, 47.5 percent had the exam flagged as inadequate.
• Classification approach: Diagnostic code structure drawn from the current regulatory text of DC 9905. Because the 2017 amendment changed the structure of the code, intermediate interincisal-millimeter thresholds should be read in the current regulation rather than relied on from memory; this page describes the rating structure (smaller opening, more restricted diet, more areas involved, higher rating) and the anchor points stated in the regulation (the 50 percent ceiling and the 0-to-4-millimeter lateral-excursion 10 percent tier).
• Limitations:
• Compensation tiers under DC 9905 are set by the current regulation. The exact millimeter cutoffs for the intermediate tiers are in the regulatory text and should be verified there, especially given the February 17, 2017 amendment.
• The qualitative evidence-gap patterns are reads from BVA decisions, not separately computed statistics. The only TMJ statistics stated here are the verbatim dataset figures (499 cases; 21.4 percent granted, 27.3 percent remanded, 51.3 percent denied; 47.5 percent of the 406 adjudicated-adequacy cases flagged inadequate).
• Selection bias: BVA-level patterns reflect cases that appealed. Most TMJ claims resolve at the RO level and aren't in any BVA dataset.
• Application of the Sharp v. Shulkin framework at the RO level is uneven.
• These observations reflect patterns from the regulatory text, case law, and BVA decisions. They are not predictions of individual outcomes.