2027 ICD-10-CM Diagnosis Code I77.82Antineutrophilic cytoplasmic antibody [ANCA] vasculitis
ICD-10-CM Codes›I00–I99›I70-I79›I77
- Billable — Valid for Submission
- Risk Adjusts — HCC 93
- Chronic Condition
I77.82 is a billable ICD-10-CM diagnosis code for antineutrophilic cytoplasmic antibody [ANCA] vasculitis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 299 through 301. Coders also document this condition as antineutrophil cytoplasmic antibody positive vasculitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified circulatory disease.
For Medicare Advantage risk adjustment, I77.82 maps to CMS-HCC Category 93 (Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders) under the V28 model, adding a risk factor of about 0.617 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
I77.82 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Antineutrophil cytoplasmic antibody positive vasculitis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I77.82: its own notes plus those printed at I77 and Chapter 9. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- ANCA associated vasculitis
- ANCA positive vasculitis
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Vasculitis
Vasculitis is an inflammation of the blood vessels. It happens when the body's immune system attacks the blood vessel by mistake. It can happen because of an infection, a medicine, or another disease. The cause is often unknown.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code History & ChangesHistory
Replacement I77.82 replaces the following previously assigned code(s):
- I77.89 - Other specified disorders of arteries and arterioles
Questions About I77.82Overview
What is the ICD-10 code for antineutrophilic cytoplasmic antibody [ANCA] vasculitis?
The ICD-10-CM code for antineutrophilic cytoplasmic antibody [ANCA] vasculitis is I77.82 (sometimes written as I7782). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is I77.82 (Other specified disorders of arteries and arterioles) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report antineutrophilic cytoplasmic antibody [ANCA] vasculitis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I77.82 group to?
When antineutrophilic cytoplasmic antibody [ANCA] vasculitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 301, 300, 299, with relative weights from 0.7132 to 1.5840 depending on complications. Higher weights mean higher Medicare reimbursement.
What HCC is I77.82?
I77.82 (antineutrophilic cytoplasmic antibody [ANCA] vasculitis) maps to CMS-HCC Category 93 (Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders), commonly written as HCC 93, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 40 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 83.
Does I77.82 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, I77.82 adds a risk adjustment factor of about 0.617 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.288 to 0.617 depending on the payment segment). HCC 93 sits at the top of its hierarchy, so no other condition category supersedes it. See the full factor table on the HCC 93 category page.
