I77.82 ICD-10-CM Code: Antineutrophilic cytoplasmic antibody [ANCA] vasculitis
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FY 2026 Apr update / Diseases of the circulatory system (I00-I99) / Diseases of arteries, arterioles and capillaries (I70-I79)
I77.82
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceAntineutrophilic cytoplasmic antibody [ANCA] vasculitis
This is an autoimmune disease where the body's immune system attacks blood vessels, causing inflammation and damage to multiple organs. It is identified by the presence of specific antibodies (ANCA) in the blood that target neutrophil proteins.
Buddy Insight
Antineutrophilic cytoplasmic antibody vasculitis is a systemic autoimmune condition causing inflammation and destruction of small blood vessels, potentially affecting kidneys, lungs, skin, and nerves.
CMS-HCC V28
MappedHCC 93
RAF 0.617
CMS-HCC V24
MappedHCC 40
RAF 0.421
ACA/HHS
MappedHCC 56
Varies by metal level
ESRD/PACE
MappedHCC 40
RAF 0.058
RXHCC
MappedHCC 83
RAF 0.222
Code Book Path
Inclusion Terms
Official- ANCA associated vasculitis
- ANCA positive vasculitis
Excludes 2
Official- eosinophilic granulomatosis with polyangiitis (M30.1)
- granulomatosis with polyangiitis (M31.3-)
- microscopic polyangiitis (M31.7)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for I77.82 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for I77.82 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for I77.82 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for I77.82 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for I77.82 in this effective period.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is I77.82 an HCC code?
Yes. I77.82 (Antineutrophilic cytoplasmic antibody [ANCA] vasculitis) maps to Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders under the CMS-HCC V28 risk adjustment model (and Rheumatoid Arthritis and Inflammatory Connective Tissue Disease under V24), with a community non-dual aged RAF of 0.617. It is billable for payment year 2026.
Coder answer: I77.82 is billable and maps to V28 HCC 93, Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- I77.82
- Description
- Antineutrophilic cytoplasmic antibody [ANCA] vasculitis
- HCC (V28)
- HCC 93 — Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders
- RAF
- 0.617
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
Each model's RAF is its CMS base weight for that model's standard population, so weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
Work I77.82 in the Code Book — tabular path, V28 RAF, and MEAT checklist →
MEAT Criteria for I77.82
For I77.82 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed I77.82 during that encounter, not just copy-forwarded from a problem list.
Coder workflow notes
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What This Code Means
I77.82 is the ICD-10-CM diagnosis code for antineutrophilic cytoplasmic antibody [anca] vasculitis. This is an autoimmune disease where the body's immune system attacks blood vessels, causing inflammation and damage to multiple organs. It is identified by the presence of specific antibodies (ANCA) in the blood that target neutrophil proteins. I77.82 sits in the ICD-10-CM chapter for diseases of the circulatory system (i00-i99), within the section covering diseases of arteries, arterioles and capillaries (i70-i79).
Under the CMS-HCC V28 risk adjustment model, I77.82 maps to Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders (HCC 93) with a community, non-dual, aged base RAF weight of 0.617. Under the older CMS-HCC V24 model, I77.82 maps to Rheumatoid Arthritis and Inflammatory Connective Tissue Disease (HCC 40) with a community, non-dual, aged base RAF weight of 0.421. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
Verify the specific type of ANCA vasculitis (such as granulomatosis with polyangiitis, microscopic polyangiitis, or eosinophilic granulomatosis with polyangiitis) in the documentation, as more specific codes may be available. Because I77.82 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for I77.82 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify the specific type of ANCA vasculitis (such as granulomatosis with polyangiitis, microscopic polyangiitis, or eosinophilic granulomatosis with polyangiitis) in the documentation, as more specific codes may be available
- •Document which organs are affected (lungs, kidneys, skin, etc.) as this information may support medical necessity and justify treatment decisions
Clinical Significance
Antineutrophilic cytoplasmic antibody vasculitis is a systemic autoimmune condition causing inflammation and destruction of small blood vessels, potentially affecting kidneys, lungs, skin, and nerves. This is a serious condition requiring immunosuppressive therapy and carrying significant morbidity. It maps to multiple HCC categories across models, reflecting its multi-system impact and high clinical complexity.
Documentation Requirements
- ✓Positive antineutrophilic cytoplasmic antibody serology with pattern specification (cytoplasmic or perinuclear)
- ✓Specific antineutrophilic cytoplasmic antibody-associated diagnosis: granulomatosis with polyangiitis, microscopic polyangiitis, or eosinophilic granulomatosis with polyangiitis
- ✓Organ involvement documentation (renal, pulmonary, dermatologic, neurologic)
- ✓Biopsy results when available showing vasculitis or glomerulonephritis
- ✓Current immunosuppressive treatment regimen
- ✓Disease activity status — active flare, remission, or maintenance
- ✓Monitoring labs including renal function, urinalysis, and inflammatory markers
Excludes 2, Not included here, may code separately
Commonly Confused Codes
- •M31.30-M31.31: Granulomatosis with polyangiitis: more specific code for this antineutrophilic cytoplasmic antibody subtype
- •M31.7: Microscopic polyangiitis: more specific code for this antineutrophilic cytoplasmic antibody subtype
- •I77.6: Arteritis, unspecified: less specific, use I77.82 when antineutrophilic cytoplasmic antibody vasculitis is confirmed
- •M30.0: Polyarteritis nodosa: different vasculitis type, typically antineutrophilic cytoplasmic antibody-negative
- •D69.0: Allergic purpura (immunoglobulin A vasculitis): different mechanism and antibody pattern