ICD-10-CM 2027
ICD-10 code for synovium disorder
From the official ICD-10-CM alphabetic index entry “Disorder (of) › synovium”. Page updated September 29, 2026.
About coding synovium disorder
The ICD-10-CM code for synovium disorder is M67.90 (Unspecified disorder of synovium and tendon, unspecified site). The official index lists 22 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M67.90.
Within M67.9, choose M67.90 (unspecified site) only when documentation doesn't support a more specific option: shoulder (M67.91), upper arm (M67.92), forearm (M67.93), hand (M67.94), thigh (M67.95), lower leg (M67.96), ankle and foot (M67.97), other site (M67.98) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 557 (Tendonitis, Myositis and Bursitis with MCC, relative weight 1.489) and DRG 558 (Tendonitis, Myositis and Bursitis without MCC, relative weight 0.8875), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific synovium disorder codes (official index)
- acromioclavicular M67.91 — Unspecified disorder of synovium and tendon, shoulder
- ankle M67.97 — Unspecified disorder of synovium and tendon, ankle and foot
- elbow M67.92 — Unspecified disorder of synovium and tendon, upper arm
- foot M67.97 — Unspecified disorder of synovium and tendon, ankle and foot
- forearm M67.93 — Unspecified disorder of synovium and tendon, forearm
- hand M67.94 — Unspecified disorder of synovium and tendon, hand
- hip M67.95 — Unspecified disorder of synovium and tendon, thigh
- knee M67.96 — Unspecified disorder of synovium and tendon, lower leg
- multiple sites M67.99 — Unspecified disorder of synovium and tendon, multiple sites
- rupture
- shoulder M67.91 — Unspecified disorder of synovium and tendon, shoulder
- specified type NEC M67.80 — Other specified disorders of synovium and tendon, unspecified site
- acromioclavicular M67.81 — Other specified disorders of synovium and tendon, shoulder
- ankle M67.87 — Other specified disorders of synovium and tendon, ankle and foot
- elbow M67.82 — Other specified disorders of synovium and tendon, elbow
- foot M67.87 — Other specified disorders of synovium and tendon, ankle and foot
- hand M67.84 — Other specified disorders of synovium and tendon, hand
- hip M67.85 — Other specified disorders of synovium and tendon, hip
- knee M67.86 — Other specified disorders of synovium and tendon, knee
- multiple sites M67.89 — Other specified disorders of synovium and tendon, multiple sites
- wrist M67.83 — Other specified disorders of synovium and tendon, wrist
- synovitis
- upper arm M67.92 — Unspecified disorder of synovium and tendon, upper arm
- wrist M67.93 — Unspecified disorder of synovium and tendon, forearm
Common questions about synovium disorder ICD-10 codes
What is the ICD-10 code for synovium disorder?
- M67.90 — Unspecified disorder of synovium and tendon, unspecified site. More specific codes apply when the documentation supports them: M67.91, M67.97, M67.92, M67.97 and others below.
What is the ICD-10 code for acromioclavicular synovium disorder?
- M67.91 — Unspecified disorder of synovium and tendon, shoulder (header code; choose a more specific subcode).
What is the ICD-10 code for ankle synovium disorder?
- M67.97 — Unspecified disorder of synovium and tendon, ankle and foot (header code; choose a more specific subcode).
What is the ICD-10 code for elbow synovium disorder?
- M67.92 — Unspecified disorder of synovium and tendon, upper arm (header code; choose a more specific subcode).
What is the ICD-10 code for foot synovium disorder?
- M67.97 — Unspecified disorder of synovium and tendon, ankle and foot (header code; choose a more specific subcode).
What is the ICD-10 code for forearm synovium disorder?
- M67.93 — Unspecified disorder of synovium and tendon, forearm (header code; choose a more specific subcode).
What is the ICD-10 code for hand synovium disorder?
- M67.94 — Unspecified disorder of synovium and tendon, hand (header code; choose a more specific subcode).
Is M67.90 billable?
- Yes. M67.90 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M67.90 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M67.90 as a principal diagnosis.
Is M67.90 a CC or MCC?
- No. M67.90 is neither a CC nor an MCC under MS-DRG v44.0.