2027 ICD-10-CM Diagnosis Code M71.329Other bursal cyst, unspecified elbow

ICD-10-CM Codes›M00–M99›M70-M79›M71

ICD-10-CM M71.329
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M71.329 is a billable ICD-10-CM diagnosis code for other bursal cyst, unspecified 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 mass of joint of elbow. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified connective tissue disease.

Code Identity

ICD-10-CM Code
M71.329
Billable Status
Yes — Valid for Submission
Code Describes
Other bursal cyst, unspecified elbow
Short Description
Other bursal cyst, unspecified elbow
Same as the full description in the CMS dataset.
Parent Code
M71.32
Other bursal cyst, elbow

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM70-M79Other soft tissue disorders
CategoryM71Other bursopathies
This CodeM71.329Other bursal cyst, unspecified elbow

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Mass of joint of elbow
  • Synovial cyst of elbow

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M71.329: its own notes plus those printed at M71.3, M71, 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 M71.3 Other bursal cyst applies to 21 codes
  • synovial cyst with rupture (M66.1-)
From M71 Other bursopathies applies to 138 codes
  • bunion (M20.1)
  • bursitis related to use, overuse or pressure (M70.-)
  • enthesopathies (M76-M77)

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 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 M71.329, its category, or a range that includes it.

Excludes2 2

These codes carry an Excludes2 note naming M71.329: its condition is not part of those codes, and both may be reported when the patient has both.

  • M67.4 Ganglion
    cyst of bursa (M71.2-M71.3) names M71.2-M71.3, which includes this code
  • M67.4 Ganglion
    cyst of synovium (M71.2-M71.3) names M71.2-M71.3, 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

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 M71.329 to ICD-9-CMHistory

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

ICD-9-CM
727.49 Bursal cyst NEC
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 M71.329Overview

What is the ICD-10 code for other bursal cyst, unspecified elbow?

The ICD-10-CM code for other bursal cyst, unspecified elbow is M71.329 (sometimes written as M71329). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is M71.329 (Other bursal cyst, elbow) a billable code?

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

What MS-DRG does M71.329 group to?

When other bursal cyst, unspecified 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 M71.329 be reported with a code from M66.1?

Not as a rule. The Excludes1 note at M71.3, which applies to M71.329, lists "synovial cyst with rupture (M66.1-)". 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 M71.329?

Under the General Equivalence Mappings, other bursal cyst, unspecified elbow converts to ICD-9-CM 727.49 (bursal cyst NEC). The mapping is approximate, so confirm the match fits the documentation.