M77.9 Enthesopathy, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Bone spur NOS
• Capsulitis NOS
• Periarthritis NOS
• Tendinitis NOS

Applies from M77 Other enthesopathies

Excludes1 (never code together)

• bursitis NOS (M71.9-)

Excludes2 (not included here)

• bursitis due to use, overuse and pressure (M70.-)
• osteophyte (M25.7)
• spinal enthesopathy (M46.0-)

MS-DRG index

Defines the logic of DRG(s) 557-558 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 726.90 Enthesopathy of unspecified site

Code annotations containing back-references to M77.9

Back-references to M77.9

• Type 1 Excludes: M67 Other disorders of synovium and tendon ("tendinitis NOS (M77.9-)")

Back-references to M77

• Type 1 Excludes: M65.2 Calcific tendinitis ("tendinitis as classified in M75-M77")
• Type 2 Excludes: M70 Soft tissue disorders related to use, overuse and pressure ("enthesopathies (M76-M77)")
• Type 1 Excludes: M71 Other bursopathies ("enthesopathies (M76-M77)")

Diagnosis Index entries for M77.9

• Enthesopathy (peripheral)

Nearby codes

• M77.5 Other enthesopathy of foot and ankle
• M77.50 Other enthesopathy of unspecified foot and ankle
• M77.51 Other enthesopathy of right foot and ankle
• M77.52 Other enthesopathy of left foot and ankle
• M77.8 Other enthesopathies, not elsewhere classified
• M77.9 Enthesopathy, unspecified (this code)