2026 ICD-10-CM Diagnosis Code M35.2Behcet's disease

ICD-10-CM Codes›M00–M99›M30-M36›M35

ICD-10-CM M35.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Systemic lupus erythematosus and connective tissue disorders.

Code Identity

ICD-10-CM Code
M35.2
Billable Status
Yes — Valid for Submission
Code Describes
Behcet's disease
Short Description
Behcet's disease
Same as the full description in the CMS dataset.
Parent Code
M35
Other systemic involvement of connective tissue

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM30-M36Systemic connective tissue disorders
CategoryM35Other systemic involvement of connective tissue
This CodeM35.2Behcet's disease

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.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Arthritis, arthritic(acute) (chronic) (nonpyogenic) (subacute)
      • in (due to)
        • Behçet's syndrome
    • Behçet's disease or syndrome
    • Ulcer, ulcerated, ulcerating, ulceration, ulcerative
      • vagina
        • in Behçet's disease
    • Ulcer, ulcerated, ulcerating, ulceration, ulcerative
      • vulva (acute) (infectional)
        • in (due to)
          • Behçet's disease

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MUS024
Systemic lupus erythematosus and connective tissue disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

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.

ICD-9-CM
136.1 Behcet's syndrome
Approximate The match is approximate rather than exact.
ICD-9-CM
136.1 Behcet's syndrome
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.
ICD-9-CM
711.20 Behcet arthritis-unspec
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M35.2Overview

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.

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.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.