2026 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 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

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 2026 (October 1, 2025 through September 30, 2026) 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

Clinical ClassificationClinical

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

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

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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M16.31Overview

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, 2025 through September 30, 2026.

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 553, 554, with relative weights from 0.8301 to 1.2963 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.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.