M65.80 ICD-10-CM Code: Other synovitis and tenosynovitis, unspecified site
M65.80 is the billable ICD-10-CM code for “Other synovitis and tenosynovitis, unspecified site” in the FY 2027 U.S. code set, effective Oct 1, 2026.
Official description
M65.80Other synovitis and tenosynovitis, unspecified site
ICD-10-CM diagnosis code · United States clinical modification
More specific than M65.80
View subcategoryM65.80 is an unspecified code, for when the note doesn’t say more. If it documents the type, cause, or site, one of these codes may fit better.
M65.81Other synovitis and tenosynovitis, shoulderM65.82Other synovitis and tenosynovitis, upper armM65.83Other synovitis and tenosynovitis, forearmM65.84Other synovitis and tenosynovitis, handM65.85Other synovitis and tenosynovitis, thighM65.86Other synovitis and tenosynovitis, lower legM65.87Other synovitis and tenosynovitis, ankle and footM65.88Other synovitis and tenosynovitis, other siteM65.89Other synovitis and tenosynovitis, multiple sitesWhere M65.80 sits
- 1
Chapter 13
Diseases of the musculoskeletal system and connective tissue (M00-M99)
- 2
Section
Disorders of synovium and tendon (M65-M67)
- 3
Category M65
Synovitis and tenosynovitis
- 4
Subcategory M65.8
Other synovitis and tenosynovitis
- 5
Code M65.80
Other synovitis and tenosynovitis, unspecified site
Notes for this code
Inclusion terms
No inclusion terms are listed for M65.80.
Code first
No “code first” instruction is listed for M65.80.
Use additional code
No “use additional code” instruction is listed for M65.80.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for M65.80.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for M65.80.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code M65.80 mean?
M65.80 is the FY 2027 U.S. ICD-10-CM code for “Other synovitis and tenosynovitis, unspecified site.”
Is M65.80 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, M65.80 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is M65.80 located in ICD-10-CM?
M65.80 is listed in Chapter 13, Diseases of the musculoskeletal system and connective tissue (M00-M99), within Disorders of synovium and tendon (M65-M67) (M65–M67), under category M65, Synovitis and tenosynovitis and subcategory M65.8, Other synovitis and tenosynovitis.
What coding notes are listed for M65.80?
No inclusion terms are listed for M65.80 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.