2027 ICD-10-CM Diagnosis Code M77.8Other enthesopathies, not elsewhere classified
ICD-10-CM Codes›M00–M99›M70-M79›M77
- Billable — Valid for Submission
- Not Chronic
M77.8 is a billable ICD-10-CM diagnosis code for other enthesopathies, not elsewhere classified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 557 through 558. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Tendon and synovial disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Bilateral enthesopathy of hands
- Bilateral enthesopathy of wrists
- Disorder of enthesis of bilateral elbow regions
- Disorder of flexor tendon of index finger
- Disorder of flexor tendon of little finger
- Disorder of flexor tendon of middle finger
- Disorder of flexor tendon of ring finger
- Disorder of flexor tendon of thumb
- Elbow tendinopathy
- Enthesitis
- Enthesopathy of elbow region
- Enthesopathy of left elbow
- Enthesopathy of left hand
- Enthesopathy of left wrist
- Enthesopathy of right elbow
- Enthesopathy of right finger
- Enthesopathy of right hand
- Enthesopathy of right wrist
- Enthesopathy of shoulder region
- Enthesopathy of wrist AND/OR carpus
- Enthesopathy of wrist and/or hand
- Peripheral enthesopathy
- Retropharyngeal tendinitis
- Tendinitis of extensor tendon of finger
- Tendinitis of extensor tendon of index finger
- Tendinitis of extensor tendon of little finger
- Tendinitis of extensor tendon of middle finger
- Tendinitis of extensor tendon of ring finger
- Tendinitis of flexor tendon of index finger
- Tendinitis of flexor tendon of little finger
- Tendinitis of flexor tendon of middle finger
- Tendinitis of flexor tendon of ring finger
- Tendinitis of flexor tendon of thumb
- Tendinitis of flexor tendon of wrist
- Tendinitis of thumb
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M77.8: its own notes plus those printed at M77 and Chapter 13. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Notes
General instructions on how these codes are used.
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name M77.8, its category, or a range that includes it.
Excludes1 2
These codes carry an Excludes1 note naming M77.8: they are not reported together with it, unless the two conditions are unrelated.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Enthesopathy (peripheral) M77.9
elbow region M77.8
foot NEC M77.8
forearm M77.8
hand M77.8
multiple sites M77.8
pelvis M77.8
specified type NEC M77.8
upper arm M77.8
wrist and carpus NEC M77.8
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Connective Tissue Disorders
Your connective tissue supports many different parts of your body, such as your skin, eyes, and heart. It is like a "cellular glue" that gives your body parts their shape and helps keep them strong. It also helps some of your tissues do their work. It is made of many kinds of proteins. Cartilage and fat are types of connective tissue.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert M77.8 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M77.8Overview
What is the ICD-10 code for other enthesopathies, not elsewhere classified?
The ICD-10-CM code for other enthesopathies, not elsewhere classified is M77.8 (sometimes written as M778). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M77.8 (Other enthesopathies) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other enthesopathies, not elsewhere classified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M77.8 group to?
When other enthesopathies, not elsewhere classified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 557, 558, with relative weights from 0.8873 to 1.4883 depending on complications. Higher weights mean higher Medicare reimbursement.
Can M77.8 be reported with a code from M71.9?
Not as a rule. The Excludes1 note at M77, which applies to M77.8, lists "bursitis NOS (M71.9-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of M77.8?
Under the General Equivalence Mappings, other enthesopathies, not elsewhere classified converts to ICD-9-CM 726.8 (periph enthesopathy NEC). The mapping is approximate, so confirm the match fits the documentation.
