2027 ICD-10-CM Diagnosis Code M67.371Transient synovitis, right ankle and foot
ICD-10-CM Codes›M00–M99›M65-M67›M67
- Billable — Valid for Submission
- Not Chronic
M67.371 is a billable ICD-10-CM diagnosis code for transient synovitis, right ankle and foot. 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 synovitis of joint of ankles
- Bilateral synovitis of joint of feet
- Bilateral transient synovitis of ankles
- Bilateral transient synovitis of feet
- Capsulitis of left ankle
- Capsulitis of right ankle
- Synovitis of ankle joint
- Synovitis of joint of foot
- Synovitis of joint of left foot
- Synovitis of joint of right foot
- Synovitis of left ankle joint
- Synovitis of right ankle joint
- Transient arthropathy of ankle joint
- Transient arthropathy of the ankle and/or foot
- Transient synovitis of left ankle
- Transient synovitis of left foot
- Transient synovitis of right ankle
- Transient synovitis of right foot
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M67.371: its own notes plus those printed at M67.3, M67, 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.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Ankle Injuries and Disorders
Your ankle bone and the ends of your two lower leg bones make up the ankle joint. Your ligaments, which connect bones to one another, stabilize and support it. Your muscles and tendons move it.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert M67.371 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M67.371Overview
What is the ICD-10 code for transient synovitis, right ankle and foot?
The ICD-10-CM code for transient synovitis, right ankle and foot is M67.371 (sometimes written as M67371). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M67.371 (Transient synovitis, ankle and foot) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report transient synovitis, right ankle and foot on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M67.371 group to?
When transient synovitis, right ankle and foot 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 M67.371 be reported with a code from M12.3?
Not as a rule. The Excludes1 note at M67.3, which applies to M67.371, lists "palindromic rheumatism (M12.3-)". 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 M67.371?
Under the General Equivalence Mappings, transient synovitis, right ankle and foot converts to ICD-9-CM 727.09 (synovitis NEC). The mapping is approximate, so confirm the match fits the documentation.
