ICD-10-CM 2027
ICD-10 code for tendon sheath abscess
From the official ICD-10-CM alphabetic index entry “Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › tendon (sheath)”. Page updated September 29, 2026.
About coding tendon sheath abscess
The ICD-10-CM code for tendon sheath abscess is M65.00 (Abscess of tendon sheath, unspecified site). The official index lists 10 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M65.00.
Within M65.0, choose M65.00 (unspecified site) only when documentation doesn't support a more specific option: shoulder (M65.01), upper arm (M65.02), forearm (M65.03), hand (M65.04), thigh (M65.05), lower leg (M65.06), ankle and foot (M65.07) and other site (M65.08).
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 tendon sheath abscess codes (official index)
- ankle M65.07 — Abscess of tendon sheath, ankle and foot
- foot M65.07 — Abscess of tendon sheath, ankle and foot
- forearm M65.03 — Abscess of tendon sheath, forearm
- hand M65.04 — Abscess of tendon sheath, hand
- lower leg M65.06 — Abscess of tendon sheath, lower leg
- pelvic region M65.05 — Abscess of tendon sheath, thigh
- shoulder region M65.01 — Abscess of tendon sheath, shoulder
- specified site NEC M65.08 — Abscess of tendon sheath, other site
- thigh M65.05 — Abscess of tendon sheath, thigh
- upper arm M65.02 — Abscess of tendon sheath, upper arm
Common questions about tendon sheath abscess ICD-10 codes
What is the ICD-10 code for tendon sheath abscess?
- M65.00 — Abscess of tendon sheath, unspecified site. More specific codes apply when the documentation supports them: M65.07, M65.07, M65.03, M65.04 and others below.
What is the ICD-10 code for ankle tendon sheath abscess?
- M65.07 — Abscess of tendon sheath, ankle and foot (header code; choose a more specific subcode).
What is the ICD-10 code for foot tendon sheath abscess?
- M65.07 — Abscess of tendon sheath, ankle and foot (header code; choose a more specific subcode).
What is the ICD-10 code for forearm tendon sheath abscess?
- M65.03 — Abscess of tendon sheath, forearm (header code; choose a more specific subcode).
What is the ICD-10 code for hand tendon sheath abscess?
- M65.04 — Abscess of tendon sheath, hand (header code; choose a more specific subcode).
What is the ICD-10 code for lower leg tendon sheath abscess?
- M65.06 — Abscess of tendon sheath, lower leg (header code; choose a more specific subcode).
What is the ICD-10 code for pelvic region tendon sheath abscess?
- M65.05 — Abscess of tendon sheath, thigh (header code; choose a more specific subcode).
Is M65.00 billable?
- Yes. M65.00 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M65.00 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M65.00 as a principal diagnosis.
Is M65.00 a CC or MCC?
- No. M65.00 is neither a CC nor an MCC under MS-DRG v44.0.