2026 ICD-10-CM Diagnosis Code M19.93Secondary osteoarthritis, unspecified site
ICD-10-CM Codes›M00–M99›M15-M19›M19
- Billable — Valid for Submission
- Chronic Condition
M19.93 is a billable ICD-10-CM diagnosis code for secondary osteoarthritis, unspecified site. 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 localized, secondary osteoarthritis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Osteoarthritis.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Localized, secondary osteoarthritis
- Localized, secondary osteoarthritis of the pelvic region and thigh
- Post infectious osteoarthritis
- Secondary localized osteoarthrosis of multiple sites
- Secondary localized osteoarthrosis of pelvic region
- Secondary osteoarthritis
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Secondary osteoarthritis NOS
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Osteoarthritis - M19.90
- secondary - M19.93
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Osteoarthritis
- secondary
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 M19.93 to ICD-9-CMHistory
Code HistoryHistory
Questions About M19.93Overview
Is M19.93 (Osteoarthritis, unspecified site) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report secondary osteoarthritis, unspecified site on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does M19.93 group to?
When secondary osteoarthritis, unspecified site 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 M19.93?
Under the General Equivalence Mappings, secondary osteoarthritis, unspecified site converts to ICD-9-CM 715.20 (loc 2nd osteoarth-unspec) and 715.28 (loc 2nd osteoarthros NEC). 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.
