M02.261 Postimmunization arthropathy, right knee

Billable ICD-10-CM code, FY2026.

Applies from M02 Postinfective and reactive arthropathies

Excludes1 (never code together)

• Behçet's disease (M35.2)
• direct infections of joint in infectious and parasitic diseases classified elsewhere (M01.-)
• postmeningococcal arthritis (A39.84)
• mumps arthritis (B26.85)
• rubella arthritis (B06.82)
• syphilis arthritis (late) (A52.77)
• rheumatic fever (I00)
• tabetic arthropathy [Charcôt's] (A52.16)

Code first

• underlying disease, such as:
• congenital syphilis [Clutton's joints] (A50.5)
• enteritis due to Yersinia enterocolitica (A04.6)
• infective endocarditis (I33.0)
• viral hepatitis (B15-B19)

MS-DRG index

Defines the logic of DRG(s) 553-554 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 713.6 Arthropathy associated with hypersensitivity reaction (approximate)
• 713.6 Arthropathy associated with hypersensitivity reaction (approximate)
• 999.52 Other serum reaction due to vaccination (approximate)

Code annotations containing back-references to M02.261

Back-references to M02.2

• Type 2 Excludes: T88.1 Other complications following immunization, not elsewhere classified ("postimmunization arthropathy (M02.2)")

Back-references to M02

• Type 1 Excludes: M01 Direct infections of joint in infectious and parasitic diseases classified elsewhere ("postinfective arthropathy (M02.-)")

Nearby codes

• M02.25 Postimmunization arthropathy, hip
• M02.251 Postimmunization arthropathy, right hip
• M02.252 Postimmunization arthropathy, left hip
• M02.259 Postimmunization arthropathy, unspecified hip
• M02.26 Postimmunization arthropathy, knee
• M02.261 Postimmunization arthropathy, right knee (this code)
• M02.262 Postimmunization arthropathy, left knee
• M02.269 Postimmunization arthropathy, unspecified knee
• M02.27 Postimmunization arthropathy, ankle and foot
• M02.271 Postimmunization arthropathy, right ankle and foot
• M02.272 Postimmunization arthropathy, left ankle and foot