General Information on Presumptive Service Connection (SC) for Persian Gulf Veterans

Overview

In This Section

This section contains the topic: “ General Information on Presumptive SC of Undiagnosed Illness and Medically Unexplained Chronic Multi-Symptom Illness (MUCMI) for Persian Gulf Veterans.”

1. General Information on Presumptive SC of Undiagnosed Illness and MUCMI for Persian Gulf Veterans

Introduction

This topic contains general information on presumptive SC of undiagnosed illness and MUCMI for Persian Gulf Veterans, including

• regulatory and statutory history regarding compensation for disabilities occurring in Persian Gulf Veterans
• references governing Persian Gulf Veteran claims
• presumptive SC under 38 U.S.C. 1117
• definition of
• Persian Gulf Veteran under 38 U.S.C. 1117
• qualifying chronic disability under 38 CFR 3.317
• undiagnosed illness
• MUCMI, and
• functional gastrointestinal disorders (FGIDs)
• partially understood MUCMIs, and
• signs and symptoms of undiagnosed illnesses or MUCMIs.

Change Date

June 6, 2025

VIII.ii.1.A.1.a. Regulatory and Statutory History Regarding Compensation for Disabilities Occurring in Persian Gulf Veterans

The table below discusses the regulatory and statutory history regarding compensation for disabilities occurring in Persian Gulf Veterans.

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Reference: For more information on presumptive SC, see the Effective Date Job Aid for Presumptive Disabilities.

VIII.ii.1.A.1.b. References Governing Persian Gulf Veteran Claims

As noted in M21-1, Part VIII, Subpart ii, 1.A.1.a, the PACT Act enacted several changes to the presumptive SC provisions for Persian Gulf Veterans.

The table below provides details on references governing the provisions of presumptive SC for Persian Gulf Veterans.

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VIII.ii.1.A.1.c. Presumptive SC Under 38 U.S.C. 1117

Under current 38 U.S.C. 1117, there is a presumption of SC for Persian Gulf Veterans with a qualifying chronic disability that became manifest to any degree at any time.

VIII.ii.1.A.1.d. Definition: Persian Gulf Veteran Under 38 U.S.C. 1117

A Persian Gulf Veteran, under 38 U.S.C. 1117, is a Veteran who served on active duty in the Armed Forces during the Gulf War period in one of the locations listed in the table below.

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Note: Per 38 U.S.C. 101(33), the Gulf War period extends from August 2, 1990, through a date yet to be determined by law or Presidential proclamation.

Reference: For more information on establishing Persian Gulf Veteran status, see M21-1, Part VIII, Subpart ii, 1.B.1.d.

VIII.ii.1.A.1.e. Definition: Qualifying Chronic Disability Under 38 CFR 3.317

Qualifying chronic disability, under 38 CFR 3.317, means a chronic disability resulting from any of the following or any combination of the following:

• an undiagnosed illness, or
• an MUCMI.

References: For more information on

• determining chronicity, see M21-1, Part VIII, Subpart ii, 1.C.1.b, and
• rating action to be taken based on specific disability patterns, see M21-1, Part VIII, Subpart ii, 1.C.1.g.

VIII.ii.1.A.1.f. Definition: Undiagnosed Illness

An undiagnosed illness is a type of chronic qualifying disability where qualifying signs and/or symptoms cannot be attributed to any known clinical diagnosis by history, physical examination and laboratory tests.

References: For more information on

• signs and symptoms of undiagnosed illness, see M21-1, Part VIII, Subpart ii, 1.A.1.j, and
• reviewing the examiner’s determination of disability pattern, see M21-1, Part VIII, Subpart ii, 1.B.2.p.

VIII.ii.1.A.1.g. Definition: MUCMI

A medically unexplained chronic multi-symptom illness (MUCMI) is a type of chronic qualifying disability in which there is a diagnosed illness that has

• either an inconclusive etiology or an inconclusive pathophysiology
• overlapping symptoms and signs, and
• features such as
• fatigue and pain
• disability out of proportion to physical findings, and
• inconsistent demonstration of laboratory abnormalities.

Note: A multi-symptom illness is not an MUCMI if both the etiology and the pathology of the illness are partly understood.

MUCMIs include but are not limited to

• chronic fatigue syndrome
• fibromyalgia, or
• FGIDs, excluding structural gastrointestinal diseases.

Reference: For more information on the definition of an MUCMI, see Stewart v. Wilkie, 30 Vet.App. 383 (2018).

VIII.ii.1.A.1.h. Definition: FGIDs

Functional gastrointestinal disorders (FGIDs) are a group of diagnosed conditions that are a type of MUCMI. They are characterized by chronic or recurrent symptoms that are

• unexplained by any structural, endoscopic, laboratory, or other objective signs of injury or disease, and
• may be related to any part of the gastrointestinal tract.

Characteristic FGID symptoms include

• abdominal pain
• substernal burning or pain
• nausea
• vomiting
• altered bowel habits (including diarrhea, constipation),
• indigestion
• bloating
• postprandial fullness, and
• painful or difficult swallowing.

FGID diagnoses include but are not limited to

• irritable bowel syndrome, and
• functional
• dyspepsia
• vomiting
• constipation
• bloating
• abdominal pain syndrome, or
• dysphagia.

Diagnosis of a FGID under generally accepted medical principles normally requires

• symptom onset at least six months prior to diagnosis, and
• the presence of symptoms sufficient to diagnose the specific disorder at least three months prior to diagnosis.

Important: FGIDs do not include structural gastrointestinal diseases, such as inflammatory bowel disease (such as ulcerative colitis or Crohn's disease) and gastroesophageal reflux disease, as these conditions are considered to be organic or structural diseases characterized by abnormalities seen on x-ray, endoscopy, or through laboratory tests.

Note: The effective date of the amendment to 38 CFR 3.317(a)(2)(i) to include FGIDs was July 15, 2011.

Reference: For more information on FGIDs and MUCMIs, see Atencio v. O’Rourke, 30 Vet.App. 74 (2018).

VIII.ii.1.A.1.i. Partially Understood Chronic Multi-symptom Illnesses

Chronic multi-symptom illnesses of partially explained etiology and pathophysiology, such as diabetes and multiple sclerosis, are not considered medically unexplained and cannot be considered a qualifying chronic disability for purposes of 38 CFR 3.317.

When adjudicating conditions with partially explained etiology, SC can only be awarded on another basis such as direct SC under 38 CFR 3.303 or presumptive SC under 38 CFR 3.307 and 38 CFR 3.309(a).

Reference: For more information on direct SC for non-presumptive disabilities, see the PACT Act Implementation Standard Operating Procedure.

VIII.ii.1.A.1.j. Signs and Symptoms of Undiagnosed Illnesses or MUCMIs

38 CFR 3.317 specifies the following 13 categories of signs or symptoms that may be manifestations of an undiagnosed illness or an MUCMI:

• joint pain
• muscle pain
• neurological signs or symptoms
• headache
• neuropsychological signs or symptoms
• gastrointestinal signs or symptoms
• abnormal weight loss
• fatigue
• sleep disturbances
• respiratory signs and symptoms (upper and lower)
• cardiovascular signs or symptoms
• skin signs and symptoms, and
• menstrual disorders.

Notes:

• The list of categories is not exclusive; signs or symptoms not represented by one of the listed categories may also qualify for consideration under 38 CFR 3.317.
• A disability that is affirmatively shown to have resulted from a cause other than service in a 38 U.S.C. 1117 location may not be compensated.

Example: Sleep apnea cannot be presumptively service-connected (SC) under the provisions of 38 CFR 3.317 since it is a diagnosable condition. If claimed, sleep apnea must be considered on a non-presumptive SC basis.