M65.00 – Abscess of tendon sheath, unspecified site

ICD-10-CM 2027 diagnosis code · Disorders of synovium and tendon

Billable code

ICD-10-CM code M65.00

Code: M65.00 (claims format: M6500)
Description: Abscess of tendon sheath, unspecified site
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
Block: M65-M67 Disorders of synovium and tendon
Parent codes: M65 › M65.0

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

M65 – Synovitis and tenosynovitis

Excludes1 (not coded here):

chronic crepitant synovitis of hand and wrist (M70.0-)
current injury - see injury of ligament or tendon by body region
soft tissue disorders related to use, overuse and pressure (M70.-)

M65.0 – Abscess of tendon sheath

Use additional code:

code (B95-B96) to identify bacterial agent.

Index terms for M65.00

Entries in the ICD-10-CM alphabetic index that lead to this code:

Abscess, tendon

Related codes in M65.0

Frequently asked questions

What is ICD-10 code M65.00?

M65.00 is the ICD-10-CM code for abscess of tendon sheath, unspecified site, in the block M65-M67 (Disorders of synovium and tendon).

Is M65.00 a billable code?

Yes. M65.00 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does M65.00 belong to?

It belongs to category M65 – Synovitis and tenosynovitis.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.