Other enthesopathies (M77) ICD-10-CM
The M77 code range covers other enthesopathies with 27 ICD-10-CM diagnosis codes. 20 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- bursitis NOS M71.9
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Codes in the M77 Range 27 codes · 20 billable
- M77 Other enthesopathiesNon-billable
- M77.0 Medial epicondylitisNon-billable
- M77.00 Medial epicondylitis, unspecified elbow
- M77.01 Medial epicondylitis, right elbow
- M77.02 Medial epicondylitis, left elbow
- M77.1 Lateral epicondylitisNon-billable
- M77.10 Lateral epicondylitis, unspecified elbow
- M77.11 Lateral epicondylitis, right elbow
- M77.12 Lateral epicondylitis, left elbow
- M77.2 Periarthritis of wristNon-billable
- M77.20 Periarthritis, unspecified wrist
- M77.21 Periarthritis, right wrist
- M77.22 Periarthritis, left wrist
- M77.3 Calcaneal spurNon-billable
- M77.30 Calcaneal spur, unspecified foot
- M77.31 Calcaneal spur, right foot
- M77.32 Calcaneal spur, left foot
- M77.4 MetatarsalgiaNon-billable
- M77.40 Metatarsalgia, unspecified foot
- M77.41 Metatarsalgia, right foot
- M77.42 Metatarsalgia, left foot
- M77.5 Other enthesopathy of foot and ankleNon-billable
- 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
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the M77 range.
Enthesopathy
A disorder occurring at the site of insertion of TENDONS or LIGAMENTS into bones or JOINT CAPSULES.
Heel Spur
A bony outgrowth on the lower surface of the CALCANEUS. Though often presenting along with plantar fasciitis (FASCIITIS, PLANTAR), they are not considered causally related.
Metatarsalgia
Pain in the region of the METATARSUS. It can include pain in the METATARSAL BONES; METATARSOPHALANGEAL JOINT; and/or intermetatarsal joints (TARSAL JOINTS).
Periarthritis
Inflammation of the tissues around a joint. (Dorland, 27th ed)
Tennis Elbow
A condition characterized by pain in or near the lateral humeral epicondyle or in the forearm extensor muscle mass as a result of unusual strain. It occurs due repetitive stresses on the elbow from activities such as tennis playing.
About the M77 Code Range
These soft tissue conditions affect the elbow, wrist, foot, or ankle.
At the elbow, M77.0 identifies the inner (medial) side, while M77.1 identifies the outer (lateral) side. Other subdivisions cover wrist conditions (M77.2), heel spurs (M77.3), metatarsalgia in the foot (M77.4), and other foot and ankle conditions (M77.5). These subdivisions distinguish right, left, and unspecified sides. M77.8 identifies other enthesopathies not classified elsewhere, and M77.9 identifies unspecified enthesopathy.
Questions About This Page
How many billable codes are in the M77 range?
Of the 27 codes in this range, 20 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the M77 range classify?
The range classifies other enthesopathies. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
