2027 ICD-10-CM Diagnosis Code M77.12Lateral epicondylitis, left elbow

ICD-10-CM Codes›M00–M99›M70-M79›M77

ICD-10-CM M77.12
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M77.12 is a billable ICD-10-CM diagnosis code for lateral epicondylitis, left elbow. 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 bilateral lateral elbow tendinopathy. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified connective tissue disease.

Code Identity

ICD-10-CM Code
M77.12
Billable Status
Yes — Valid for Submission
Code Describes
Lateral epicondylitis, left elbow
Short Description
Lateral epicondylitis, left elbow
Same as the full description in the CMS dataset.
Parent Code
M77.1
Lateral epicondylitis

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM70-M79Other soft tissue disorders
CategoryM77Other enthesopathies
This CodeM77.12Lateral epicondylitis, left elbow

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral lateral elbow tendinopathy
  • Disorder of enthesis of bilateral elbow regions
  • Elbow tendinopathy
  • Enthesopathy of left elbow
  • Enthesopathy of right elbow
  • Lateral epicondylitis
  • Left lateral elbow tendinopathy
  • Right lateral elbow tendinopathy

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M77.12: 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.

From M77 Other enthesopathies applies to 20 codes

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.

From M77 Other enthesopathies applies to 20 codes
  • bursitis due to use, overuse and pressure (M70.-)
  • osteophyte (M25.7)
  • spinal enthesopathy (M46.0-)
From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • 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.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • 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 M77.12, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming M77.12: they are not reported together with it, unless the two conditions are unrelated.

  • M65.2 Calcific tendinitis
    tendinitis as classified in M75-M77 names M75-M77, which includes this code
  • M71 Other bursopathies
    enthesopathies (M76-M77) names M76-M77, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming M77.12: its condition is not part of those codes, and both may be reported when the patient has both.

  • M70 Soft tissue disorders related to use, overuse and pressure
    enthesopathies (M76-M77) names M76-M77, which includes this code

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MUS025
Other specified connective tissue disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • 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.

Patient EducationClinical

Elbow Injuries and Disorders

Your elbow joint is made up of bone, cartilage, ligaments and fluid. Muscles and tendons help the elbow joint move. When any of these structures is hurt or diseased, you have elbow problems.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert M77.12 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
726.32 Lateral epicondylitis
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About M77.12Overview

What is the ICD-10 code for lateral epicondylitis, left elbow?

The ICD-10-CM code for lateral epicondylitis, left elbow is M77.12 (sometimes written as M7712). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is M77.12 (Lateral epicondylitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report lateral epicondylitis, left elbow on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does M77.12 group to?

When lateral epicondylitis, left elbow 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 M77.12 be reported with a code from M71.9?

Not as a rule. The Excludes1 note at M77, which applies to M77.12, 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 M77.12?

Under the General Equivalence Mappings, lateral epicondylitis, left elbow converts to ICD-9-CM 726.32 (lateral epicondylitis). The mapping is approximate, so confirm the match fits the documentation.