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Alphabetic Index and Tabular path
HCC Buddy public API, FY2026 Apr updateSource load source requiredSource year 2026Updated 2026-04-01

Index trail

Major histocompatibility complex class II deficiency

See Tabular List: D81.7

D81, Combined immunodeficiencies

D81.7, Major histocompatibility complex class II deficiency

Selected code, source checked for the selected effective period

Commonly confused codes

official source

Not listed for this effective period.

Code details and official notes

D81.7

Major histocompatibility complex class II deficiency

Open the shareable code page for D81.7→
billableHCC mapped

Includes

official source

Not listed for this effective period.

Excludes 1

official source
  • autosomal recessive agammaglobulinemia (Swiss type) (D80.0)

Excludes 2

official source

No Excludes 2 note is listed in this source payload.

Code First

official source

Not listed for this effective period.

Use Additional

official source

Not listed for this effective period.

Code Also

official source

Not listed for this effective period.

7th character

official source

Not listed for this code in the selected Tabular payload.

Placeholder X

official source

Not listed for this code in the selected Tabular payload.

Laterality

official source

No laterality instruction is listed for this code in the selected Tabular payload.

Effective period

source required
  • FY2026 Apr update
  • Source year 2026
  • Updated 2026-04-01
  • HCC Buddy public API
HCC Buddy
HCC Buddy
Alphabetic Index and Tabular path
HCC Buddy public API, FY2026 Apr updateSource load source requiredSource year 2026Updated 2026-04-01

Index trail

Major histocompatibility complex class II deficiency

See Tabular List: D81.7

D81, Combined immunodeficiencies

D81.7, Major histocompatibility complex class II deficiency

Selected code, source checked for the selected effective period

Commonly confused codes

official source

Not listed for this effective period.

Code details and official notes

D81.7

Major histocompatibility complex class II deficiency

Open the shareable code page for D81.7→
billableHCC mapped

Includes

official source

Not listed for this effective period.

Excludes 1

official source
  • autosomal recessive agammaglobulinemia (Swiss type) (D80.0)

Excludes 2

official source

No Excludes 2 note is listed in this source payload.

Code First

official source

Not listed for this effective period.

Use Additional

official source

Not listed for this effective period.

Code Also

official source

Not listed for this effective period.

7th character

official source

Not listed for this code in the selected Tabular payload.

Placeholder X

official source

Not listed for this code in the selected Tabular payload.

Laterality

official source

No laterality instruction is listed for this code in the selected Tabular payload.

Effective period

source required
  • FY2026 Apr update
  • Source year 2026
  • Updated 2026-04-01
  • HCC Buddy public API
HCC Buddy Insights

HCC Mapping

HCC 114 Common Variable and Combined Immunodeficiencies (V28)HCC 47 Disorders of Immunity (V24)HCC 99 Immunodeficiencies (RxHCC)HCC 47 Disorders of Immunity (ESRD/PACE)HCC 73 HHS-HCC 73; HHS-HCC 2026 benefit year (HHS-HCC)

RAF Value

V28: RAF: 2.262V24: RAF: 0.665RxHCC: RAF: 0.943ESRD/PACE: RAF: 0.078HHS-HCC: RAF: Varies by metal level

Model Period

FY2026 Apr update

Source

source required

Audit Caution

Close codes need documentation support before selection. Do not assume relationships.
Reviewed by the HCC Buddy Coding Team

HCC Buddy workflow band

HCC mapping, RAF, MEAT, source trail, and audit caution stay in view.

MEAT supportaudit cautionsource required

V28

HCC 114

Common Variable and Combined Immunodeficiencies

RAF: 2.262

V24

HCC 47

Disorders of Immunity

RAF: 0.665

RxHCC

RxHCC 99

Immunodeficiencies

RAF: 0.943

ESRD/PACE

HCC 47

Disorders of Immunity

RAF: 0.078

HHS-HCC

HCC 73

HHS-HCC 73; HHS-HCC 2026 benefit year

RAF: Varies by metal level

MEAT checklist

Reviewed by the HCC Buddy Coding Team

Monitor, Evaluate, Assess, or Treat must be supported in the provider note.

HCC Buddy guidance, not official ICD-10-CM text.

Audit caution

Reviewed by the HCC Buddy Coding Team

Close codes need documentation support before selection. Do not assume relationships.

HCC Buddy guidance, not official ICD-10-CM text.

Reviewer sign-off

Reviewed by the HCC Buddy Coding Team

MEAT, documentation support, audit cautions, and close-code guidance are reviewed and approved for this effective period.

HCC Buddy enrichment is separate from official source text.

Last updated: April 1, 2026 · Not a substitute for official coding guidelines. No PHI or patient data.
HCC Buddy Code Card
FY 2026 Apr update
D81.7Billable

Major histocompatibility complex class II deficiency

CMS-HCC V28

HCC 114

RAF 2.262

CMS-HCC V24

HCC 47

RAF 0.665

RxHCC

RxHCC 99

RAF 0.943

Reviewed by the HCC Buddy Coding TeamFY2026 Apr update

Code

D81.7

V28 HCC

HCC 114

RAF

2.262

Compare tray

Add close codes to compare documentation differences.