ICD-10-CM 2027
ICD-10 code for enthesopathy
From the official ICD-10-CM alphabetic index entry “Enthesopathy (peripheral)”. Page updated September 29, 2026.
About coding enthesopathy
The ICD-10-CM code for enthesopathy is M77.9 (Enthesopathy, unspecified). The official index lists 28 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M77.9.
Within M77, choose M77.9 (Enthesopathy, unspecified) only when documentation doesn't support a more specific option: medial epicondylitis (M77.0), lateral epicondylitis (M77.1), Periarthritis of wrist (M77.2), Calcaneal spur (M77.3), Metatarsalgia (M77.4), other enthesopathy of foot and ankle (M77.5) and not elsewhere classified (M77.8).
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 enthesopathy codes (official index)
- Achilles tendinitis
- ankle and tarsus M77.5 — Other enthesopathy of foot and ankle
- specified type NEC
- anterior tibial syndrome M76.81 — Anterior tibial syndrome
- calcaneal spur
- elbow region M77.8 — Other enthesopathies, not elsewhere classified
- lateral epicondylitis
- medial epicondylitis
- foot NEC M77.8 — Other enthesopathies, not elsewhere classified
- metatarsalgia
- specified type NEC M77.5 — Other enthesopathy of foot and ankle
- forearm M77.8 — Other enthesopathies, not elsewhere classified
- gluteal tendinitis
- hand M77.8 — Other enthesopathies, not elsewhere classified
- hip
- iliac crest spur
- iliotibial band syndrome
- knee
- lateral epicondylitis
- lower limb (excluding foot) M76.9 — Unspecified enthesopathy, lower limb, excluding foot
- Achilles tendinitis
- ankle and tarsus M77.5 — Other enthesopathy of foot and ankle
- specified type NEC
- anterior tibial syndrome M76.81 — Anterior tibial syndrome
- gluteal tendinitis
- iliac crest spur
- iliotibial band syndrome
- patellar tendinitis
- pelvic region
- peroneal tendinitis
- posterior tibial syndrome M76.82 — Posterior tibial tendinitis
- psoas tendinitis
- specified type NEC M76.89 — Other specified enthesopathies of lower limb, excluding foot
- tibial collateral bursitis
- medial epicondylitis
- metatarsalgia
- multiple sites M77.8 — Other enthesopathies, not elsewhere classified
- patellar tendinitis
- pelvis M77.8 — Other enthesopathies, not elsewhere classified
- periarthritis of wrist
- peroneal tendinitis
- posterior tibial syndrome M76.82 — Posterior tibial tendinitis
- psoas tendinitis
- shoulder region
- specified type NEC M77.8 — Other enthesopathies, not elsewhere classified
- spinal M46.00 — Spinal enthesopathy, site unspecified
- cervical region M46.02 — Spinal enthesopathy, cervical region
- cervicothoracic region M46.03 — Spinal enthesopathy, cervicothoracic region
- lumbar region M46.06 — Spinal enthesopathy, lumbar region
- lumbosacral region M46.07 — Spinal enthesopathy, lumbosacral region
- multiple sites M46.09 — Spinal enthesopathy, multiple sites in spine
- occipito-atlanto-axial region M46.01 — Spinal enthesopathy, occipito-atlanto-axial region
- sacrococcygeal region M46.08 — Spinal enthesopathy, sacral and sacrococcygeal region
- thoracic region M46.04 — Spinal enthesopathy, thoracic region
- thoracolumbar region M46.05 — Spinal enthesopathy, thoracolumbar region
- tibial collateral bursitis
- upper arm M77.8 — Other enthesopathies, not elsewhere classified
- wrist and carpus NEC M77.8 — Other enthesopathies, not elsewhere classified
- calcaneal spur
- periarthritis of wrist
Common questions about enthesopathy ICD-10 codes
What is the ICD-10 code for enthesopathy?
- M77.9 — Enthesopathy, unspecified. More specific codes apply when the documentation supports them: M77.5, M76.81, M77.8, M77.8 and others below.
What is the ICD-10 code for ankle and tarsus enthesopathy?
- M77.5 — Other enthesopathy of foot and ankle (header code; choose a more specific subcode).
What is the ICD-10 code for anterior tibial syndrome enthesopathy?
- M76.81 — Anterior tibial syndrome (header code; choose a more specific subcode).
What is the ICD-10 code for elbow region enthesopathy?
- M77.8 — Other enthesopathies, not elsewhere classified.
What is the ICD-10 code for foot nec enthesopathy?
- M77.8 — Other enthesopathies, not elsewhere classified.
What is the ICD-10 code for forearm enthesopathy?
- M77.8 — Other enthesopathies, not elsewhere classified.
What is the ICD-10 code for hand enthesopathy?
- M77.8 — Other enthesopathies, not elsewhere classified.
Is M77.9 billable?
- Yes. M77.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M77.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M77.9 as a principal diagnosis.
Is M77.9 a CC or MCC?
- No. M77.9 is neither a CC nor an MCC under MS-DRG v44.0.