2027 ICD-10-CM Diagnosis Code M16.31Unilateral osteoarthritis resulting from hip dysplasia, right hip

ICD-10-CM Codes›M00–M99›M15-M19›M16

ICD-10-CM M16.31
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M16.31 is a billable ICD-10-CM diagnosis code for unilateral osteoarthritis resulting from hip dysplasia, right hip. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 553 through 554. Coders also document this condition as osteoarthritis of hip due to dysplasia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Osteoarthritis.

This medical diagnosis code is frequently used in Orthopedics medical specialties to designate conditions such osteoarthritis of the hip.

Code Identity

ICD-10-CM Code
M16.31
Billable Status
Yes — Valid for Submission
Code Describes
Unilateral osteoarthritis resulting from hip dysplasia, right hip
Short Description
Unilateral osteoarth resulting from hip dysplasia, right hip
Parent Code
M16.3
Unilateral osteoarthritis resulting from hip dysplasia

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM15-M19Osteoarthritis
CategoryM16Osteoarthritis of hip
This CodeM16.31Unilateral osteoarthritis resulting from hip dysplasia, right hip

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Osteoarthritis of hip due to dysplasia
  • Osteoarthritis of right hip joint
  • Osteoarthritis of right hip joint due to dysplasia
  • Secondary osteoarthritis of hip
  • Secondary osteoarthritis of right hip

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M16.31: its own notes plus those printed at block M00-M25, block M15-M19, and Chapter 13. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block M00-M25 applies to 2,249 codes
  • Disorders affecting predominantly peripheral (limb) joints

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 Block M15-M19 Osteoarthritis applies to 98 codes
  • osteoarthritis of spine (M47.-)
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 M16.31, its category, or a range that includes it.

Excludes1 5

These codes carry an Excludes1 note naming M16.31: they are not reported together with it, unless the two conditions are unrelated.

  • M12 Other and unspecified arthropathy
    arthrosis (M15-M19) names M15-M19, which includes this code
  • M13 Other arthritis
    arthrosis (M15-M19) names M15-M19, which includes this code
  • M13 Other arthritis
    osteoarthritis (M15-M19) names M15-M19, which includes this code
  • M13.8 Other specified arthritis
    osteoarthritis (M15-M19) names M15-M19, which includes this code
  • M15 Polyosteoarthritis
    bilateral involvement of single joint (M16-M19) names M16-M19, which includes this code

Clinical ClassificationClinical

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

CCSR MUS006
Osteoarthritis
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Osteoarthritis, Hip

    noninflammatory degenerative disease of the hip joint which usually appears in late middle or old age. it is characterized by growth or maturational disturbances in the femoral neck and head, as well as acetabular dysplasia. a dominant symptom is pain on weight-bearing or motion.

Patient EducationClinical

Osteoarthritis

Osteoarthritis, sometimes called OA, is a type of arthritis that only affects the joints, usually in the hands, knees, hips, neck, and lower back. It's the most common type of arthritis.

The full article covers:

  • What is osteoarthritis?
  • What are the symptoms of osteoarthritis?
  • What causes osteoarthritis?
  • Who is more likely to develop osteoarthritis?
  • How is osteoarthritis diagnosed?
  • What are the treatments for osteoarthritis?

Read the full article at MedlinePlus

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

Convert M16.31 to ICD-9-CMHistory

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

ICD-9-CM
715.25 Loc 2nd osteoarth-pelvis
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 M16.31Overview

What is the ICD-10 code for unilateral osteoarthritis resulting from hip dysplasia, right hip?

The ICD-10-CM code for unilateral osteoarthritis resulting from hip dysplasia, right hip is M16.31 (sometimes written as M1631). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is M16.31 (Unilateral osteoarthritis resulting from hip dysplasia) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unilateral osteoarthritis resulting from hip dysplasia, right hip on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does M16.31 group to?

When unilateral osteoarthritis resulting from hip dysplasia, right hip is the principal diagnosis on an inpatient stay, it groups to MS-DRG 554, 553, with relative weights from 0.8328 to 1.2492 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M16.31?

Under the General Equivalence Mappings, unilateral osteoarthritis resulting from hip dysplasia, right hip converts to ICD-9-CM 715.25 (loc 2nd osteoarth-pelvis). The mapping is approximate, so confirm the match fits the documentation.