2027 ICD-10-CM Diagnosis Code M65.812Other synovitis and tenosynovitis, left shoulder
ICD-10-CM Codes›M00–M99›M65-M67›M65
- Billable — Valid for Submission
- Not Chronic
M65.812 is a billable ICD-10-CM diagnosis code for other synovitis and tenosynovitis, left shoulder. 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. Coders also document this condition as chronic synovitis of bilateral shoulder regions due to hemarthrosis. 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.
- Chronic synovitis of bilateral shoulder regions due to hemarthrosis
- Chronic synovitis of left shoulder due to hemarthrosis
- Chronic synovitis of right shoulder due to hemarthrosis
- Chronic synovitis of shoulder due to hemarthrosis
- Shoulder synovitis
- Synovitis of left glenohumeral joint
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M65.812: its own notes plus those printed at M65 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
Joint Disorders
Your joints are places where two or more bones come together. Your shoulders, elbows, hips, knees, and knuckles are all joints. Your spine has joints, too.
The full article covers:
- What are joints?
- What are joint disorders?
- What diseases can affect the joints?
- What types of joint disorders happen from sudden injuries?
- What types of joint disorders happen from overuse?
- How can I keep my joints healthy?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert M65.812 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M65.812Overview
What is the ICD-10 code for other synovitis and tenosynovitis, left shoulder?
The ICD-10-CM code for other synovitis and tenosynovitis, left shoulder is M65.812 (sometimes written as M65812). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M65.812 (Other synovitis and tenosynovitis, shoulder) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other synovitis and tenosynovitis, left shoulder on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M65.812 group to?
When other synovitis and tenosynovitis, left shoulder 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 M65.812 be reported with a code from M70.0?
Not as a rule. The Excludes1 note at M65, which applies to M65.812, lists "chronic crepitant synovitis of hand and wrist (M70.0-)". 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 M65.812?
Under the General Equivalence Mappings, other synovitis and tenosynovitis, left shoulder converts to ICD-9-CM 727.09 (synovitis NEC). The mapping is approximate, so confirm the match fits the documentation.
