M77.9 — Enthesopathy, unspecified
M77.9 is a billable, specific ICD-10-CM code for enthesopathy, unspecified. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Bone spur NOS
- Capsulitis NOS
- Periarthritis NOS
- Tendinitis NOS
Other codes that can never be billed with M77.9
These codes carry an Excludes1 note pointing at M77.9. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading M77.9 alone.
- M67Other disorders of synovium and tendon
Risk adjustment
M77.9 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
M77.9 is named in 7 Medicare coverage policies — 1 listing it as supporting medical necessity, and 6 listing it as NOT covered. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A58865Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
- A58893Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
- A59374Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
- A59434Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
How M77.9 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to M77.9.
- Enthesopathy(peripheral)
Related codes at this level
Codes that share M77. If M77.9 is not quite right, the correct code is usually one of these.
Questions about M77.9
- Is M77.9 a billable ICD-10-CM code?
- Yes. M77.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does M77.9 sit in the tabular list?
- Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Other soft tissue disorders (M70-M79).