38 CFR Part 4 — 38 CFR § 4.124a

Chorea, Huntington's — VA Diagnostic Code 8106

Neurological

Diagnostic code

8106

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38 CFR § 4.124a lists Diagnostic Code 8106 as “Chorea, Huntington's.” The title ends with a period. The criteria cell says to rate as Sydenham's chorea, and adds that this, though a familial disease, has its onset in late adult life and is considered a ratable disability. The rating cell on that sentence is empty. The Sydenham's chorea lines under DC 8105 are 100, 80, 50, 30, and 10. Appendix B to Part 4 indexes “Chorea, Huntington's.” The catalog slug is dc-8106-chorea-huntington-s.

Reviewed 2026-10-05. Text checked against the eCFR versioner full-text XML for 2026-10-01 on 2026-10-05. Title 38 was last amended on 2026-08-27. On 2026-10-05 the titles list reports up to date as of 2026-10-02. Section 4.124a source note: 29 FR 6718, May 22, 1964, as amended at 40 FR 42540, Sept. 15, 1975; 41 FR 11302, Mar. 18, 1976; 43 FR 45362, Oct. 2, 1978; 54 FR 4282, Jan. 30, 1989; 54 FR 49755, Dec. 1, 1989; 55 FR 154, Jan. 3, 1990; 56 FR 51653, Oct. 15, 1991; 57 FR 24364, June 9, 1992; 70 FR 75399, Dec. 20, 2005; 73 FR 54705, Sept. 23, 2008; 73 FR 69554, Nov. 19, 2008; 76 FR 78824, Dec. 20, 2011; 79 FR 2100, Jan. 13, 2014.

The rating criteria at each level

8106 Chorea, Huntington's

Rating %: —

Criteria (verbatim). Rate as Sydenham's chorea. This, though a familial disease, has its onset in late adult life, and is considered a ratable disability.

Rating %	Criteria (verbatim)
—	Rate as Sydenham's chorea. This, though a familial disease, has its onset in late adult life, and is considered a ratable disability.

8105 Sydenham's chorea — the lines DC 8106 names

Rating %: 100

Criteria (verbatim). Pronounced, progressive grave types

Rating %: 80

Criteria (verbatim). Severe

Rating %: 50

Criteria (verbatim). Moderately severe

Rating %: 30

Criteria (verbatim). Moderate

Rating %: 10

Criteria (verbatim). Mild

Rating %	Criteria (verbatim)
100	Pronounced, progressive grave types
80	Severe
50	Moderately severe
30	Moderate
10	Mild

Note under DC 8105: Consider rheumatic etiology and complications.

That note is printed under Sydenham's chorea. It is not printed again under DC 8106. The five percentage lines do not end with a period.

The DC 8106 sentence ends with a period. It says the disease is considered a ratable disability. It does not print its own 100, 80, 50, 30, or 10.

38 CFR § 4.7 assigns the higher rating when the disability picture more nearly approximates the criteria required for that rating. Otherwise, the lower rating will be assigned. 38 CFR § 4.6 requires each element affecting the evidence to be studied so that decisions will be equitable and just. 38 CFR § 4.14 says the evaluation of the same disability under various diagnoses is to be avoided, and that the evaluation of the same manifestation under different diagnoses is to be avoided.

The 2026-10-01 text of 38 CFR § 3.309 does not contain “chorea,” “Huntington,” or “8106.” 38 CFR § 3.815 lists “Huntington's disease” among covered birth defects for the chapter 18 monetary allowance. It does not assign DC 8106. This page does not add DC 8106 to a presumptive row.

Source: 38 CFR § 4.124a, Diagnostic Codes 8106 and 8105, eCFR full-text XML for 2026-10-01. The source note prints 29 FR 6718, May 22, 1964, as amended at 40 FR 42540, Sept. 15, 1975; 41 FR 11302, Mar. 18, 1976; 43 FR 45362, Oct. 2, 1978; 54 FR 4282, Jan. 30, 1989; 54 FR 49755, Dec. 1, 1989; 55 FR 154, Jan. 3, 1990; 56 FR 51653, Oct. 15, 1991; 57 FR 24364, June 9, 1992; 70 FR 75399, Dec. 20, 2005; 73 FR 54705, Sept. 23, 2008; 73 FR 69554, Nov. 19, 2008; 76 FR 78824, Dec. 20, 2011; 79 FR 2100, Jan. 13, 2014.

What the words mean in your records

Rate as Sydenham's chorea

That is the instruction. The percentages are the DC 8105 lines: pronounced, progressive grave types at 100; severe at 80; moderately severe at 50; moderate at 30; mild at 10.

Familial, and still ratable

The same cell says this, though a familial disease, has its onset in late adult life, and is considered a ratable disability.

The rheumatic note stays on DC 8105

“Consider rheumatic etiology and complications.” is printed under DC 8105. It is not repeated as a DC 8106 note.

Evidence that speaks to each level

100, 80, 50, 30, or 10

What the rater needs to see. Huntington's chorea rated as Sydenham's chorea, on the line that matches pronounced progressive grave types, severe, moderately severe, moderate, or mild.

Where that usually lives. The neurological examination, read against those words.

Level	What the rater needs to see	Where that usually lives
100, 80, 50, 30, or 10	Huntington's chorea rated as Sydenham's chorea, on the line that matches pronounced progressive grave types, severe, moderately severe, moderate, or mild.	The neurological examination, read against those words.

VA’s public DBQ list, checked October 5, 2026, names “Central Nervous System and Neuromuscular Diseases” under Neurological. The file is Central Nervous System and Neuromuscular Diseases.

The exam form

DC 8106 points at the DC 8105 lines. This page does not say the form replaces those lines.

Related codes and how they interact

Sydenham's chorea is DC 8105

DC 8105 is the code the rate-as sentence names. Its note says to consider rheumatic etiology and complications. DC 8106 does not reprint that note.

Secondary conditions and presumptions

Section 3.309 does not contain “chorea,” “Huntington,” or “8106.” Section 3.815 lists “Huntington's disease” for a chapter 18 birth-defect allowance and does not assign DC 8106. This page does not add DC 8106 to a presumptive row.

A separate question, when a presumption does not decide it, is a medical question on the facts under 38 CFR § 3.310. Paragraph (a) covers disability proximately due to or the result of a service-connected disease or injury. Paragraph (b) covers increase in severity and requires a medical baseline.

Short answers

How does VA rate Huntington's chorea under DC 8106?

Under 38 CFR § 4.124a, Diagnostic Code 8106 says to rate Huntington's chorea as Sydenham's chorea. Those lines are 100, 80, 50, 30, and 10. Education only. VA decides on the evidence.

Does § 3.815 assign DC 8106?

No. Section 3.815 lists “Huntington's disease” among covered birth defects for the chapter 18 allowance. It does not assign diagnostic code 8106. Section 3.309 does not contain “Huntington.”

FAQ

What percentages does DC 8106 print?

None on its own row. It says to rate as Sydenham's chorea. Those DC 8105 lines are 100, 80, 50, 30, and 10. Education only.

Does the familial-disease sentence remove the rating?

No. The cell says this, though a familial disease, has its onset in late adult life, and is considered a ratable disability.

Where is the rheumatic note?

Under DC 8105. It says “Consider rheumatic etiology and complications.” It is not printed again under DC 8106.

Next steps

Read the decision for DC 8106 and which Sydenham's chorea line was used.
The free worksheet is a place to write the code, the findings, and the records you already have. It does not file a claim or protect a filing date. An accredited representative is at find a VSO.
Other neurological codes are on the neurological diagnostic-code index. The category page is neurological conditions.

Education only. Not legal or medical advice. My Claim Packet is not a VA-accredited representative and does not file claims. VA decides every claim on its own evidence.

Other codes in this body system

Nearby catalog entries in Neurological, ordered by diagnostic code number. All Neurological codes

Also: DC code lookup (tools) lists the same index in a compact layout.

Source: 38 CFR Part 4, Diagnostic Code 8106 • va.gov

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