2026 ICD-10-CM Diagnosis Code M35.2Behcet's disease
ICD-10-CM Codes›M00–M99›M30-M36›M35
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 94
- Chronic Condition
M35.2 is a billable ICD-10-CM diagnosis code for Behcet's disease. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 545 through 547. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 942 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Systemic lupus erythematosus and connective tissue disorders.
For Medicare Advantage risk adjustment, M35.2 maps to CMS-HCC Category 94 (Systemic Lupus Erythematosus and Other Specified Systemic Connective Tissue Disorders) under the V28 model, adding a risk factor of about 0.268 for a community, non-dual, aged beneficiary in payment year 2026.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
M35.2 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 2026.
Source: CMS Payment Year 2026 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.
- Anogenital ulceration due to Behcet disease
- Arthropathy in Behcet's syndrome
- Arthropathy in Behcet's syndrome of multiple sites
- Arthropathy in Behcet's syndrome of the ankle
- Arthropathy in Behcet's syndrome of the ankle and/or foot
- Arthropathy in Behcet's syndrome of the hand
- Arthropathy in Behcet's syndrome of the pelvic region and thigh
- Arthropathy in Behcet's syndrome of the shoulder region
- Arthropathy in Behcet's syndrome of the spine
- Arthropathy of left ankle due to Behcet syndrome
- Arthropathy of left knee due to Behcet syndrome
- Arthropathy of right ankle due to Behcet syndrome
- Arthropathy of right knee due to Behcet syndrome
- Behcet disease of eye
- Behcet disease of skin
- Behçet disease of small intestine
- Behçet's disease affecting oral mucosa
- Behcet's disease with multisystem involvement
- Behcet's disease with organ/system involvement
- Behcet's syndrome
- Behcet's syndrome, complete type
- Behcet's syndrome, incomplete type
- Behcet's syndrome, intestinal type
- Behcet's syndrome, neurologic type
- Behcet's syndrome, vascular type
- Dementia due to Behcet syndrome
- Demyelination due to systemic vasculitis
- Demyelination of central nervous system due to Behcet disease
- Disorder of joint of bilateral shoulder regions due to Behcet syndrome
- Disorder of joint of left shoulder region due to Behcet syndrome
- Disorder of joint of right shoulder region due to Behcet syndrome
- Iritis in Behcet's syndrome
- Meningitis due to Behcet disease
- Mucocutaneous Behçet disease
- Myelitis due to Behcet disease
- Myelitis due to vasculitis
- Panuveitis in Behcet's syndrome
- Penile ulceration due to Behçet's disease
- Ulcer of anus
- Ulcer of scrotum
- Ulcer of small intestine due to Behcet syndrome
- Ulceration of scrotum due to Behcet disease
- Ulceration of vulva associated with another disorder
- Ulceration of vulva in Behcet's disease
- Vasculitis due to systemic disease
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.
Clinical InformationClinical
Arthropathy in Behcet's Syndrome
arthropathy resulting from behcet's syndrome.
Patient EducationClinical
Behcet's Syndrome
Behcet's syndrome is a disease that involves vasculitis, which is inflammation of the blood vessels. It causes problems in many parts of the body. The most common symptoms are:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert M35.2 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M35.2Overview
What is the ICD-10 code for Behcet's disease?
The ICD-10-CM code for Behcet's disease is M35.2 (sometimes written as M352). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is M35.2 (Other systemic involvement of connective tissue) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report Behcet's disease on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does M35.2 group to?
When Behcet's disease is the principal diagnosis on an inpatient stay, it groups to MS-DRG 545, 546, 547, with relative weights from 0.8362 to 2.4817 depending on complications. Higher weights mean higher Medicare reimbursement.
Is M35.2 a CC or MCC?
CMS lists M35.2 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 942 closely related codes in its exclusion list.
What is the ICD-9 equivalent of M35.2?
Under the General Equivalence Mappings, Behcet's disease converts to ICD-9-CM 136.1 (Behcet's syndrome), 136.1 (Behcet's syndrome), and 711.20 (behcet arthritis-unspec). The mapping is approximate, so confirm the match fits the documentation.
What HCC is M35.2?
M35.2 (Behcet's disease) maps to CMS-HCC Category 94 (Systemic Lupus Erythematosus and Other Specified Systemic Connective Tissue Disorders), commonly written as HCC 94, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2026. 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 M35.2 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, M35.2 adds a risk adjustment factor of about 0.268 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.196 to 0.297 depending on the payment segment). A more severe related category (HCC 93) supersedes it when both are reported. See the full factor table on the HCC 94 category page.
