2027 ICD-10-CM Diagnosis Code M19.079Primary osteoarthritis, unspecified ankle and foot
ICD-10-CM Codes›M00–M99›M15-M19›M19
- Billable — Valid for Submission
- Chronic Condition
M19.079 is a billable ICD-10-CM diagnosis code for primary osteoarthritis, unspecified ankle and foot. 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. 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, primary osteoarthritis
- Localized, primary osteoarthritis of the ankle and/or foot
- Localized, primary osteoarthritis of toe
- Osteoarthritis of ankle
- Osteoarthritis of ankle and/or foot
- Osteoarthritis of calcaneocuboid joint
- Osteoarthritis of first metatarsophalangeal joint
- Osteoarthritis of foot joint
- Osteoarthritis of midfoot
- Osteoarthritis of subtalar joint
- Osteoarthritis of talonavicular joint
- Osteoarthritis of toe joint
- Primary calcaneocuboid osteoarthritis
- Primary osteoarthritis of ankle
- Primary osteoarthritis of first metatarsophalangeal joint
- Primary osteoarthritis of midfoot
- Primary subtalar osteoarthritis
- Primary talonavicular osteoarthritis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M19.079: its own notes plus those printed at M19, 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.
- Disorders affecting predominantly peripheral (limb) joints
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
- osteoarthritis of spine (M47.-)
- 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.
- 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 M19.079, its category, or a range that includes it.
Excludes1 5
These codes carry an Excludes1 note naming M19.079: they are not reported together with it, unless the two conditions are unrelated.
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 M19.079 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M19.079Overview
What is the ICD-10 code for primary osteoarthritis, unspecified ankle and foot?
The ICD-10-CM code for primary osteoarthritis, unspecified ankle and foot is M19.079 (sometimes written as M19079). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M19.079 (Primary osteoarthritis ankle and foot) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report primary osteoarthritis, unspecified ankle and foot on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M19.079 group to?
When primary osteoarthritis, unspecified ankle and foot 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.
Can M19.079 be reported with a code from M15?
Not as a rule. The Excludes1 note at M19, which applies to M19.079, lists "polyarthritis (M15.-)". 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 M19.079?
Under the General Equivalence Mappings, primary osteoarthritis, unspecified ankle and foot converts to ICD-9-CM 715.17 (loc prim osteoarth-ankle). The mapping is approximate, so confirm the match fits the documentation.
