2027 ICD-10-CM Diagnosis Code M17.5Other unilateral secondary osteoarthritis of knee
ICD-10-CM Codes›M00–M99›M15-M19›M17
- Billable — Valid for Submission
- Chronic Condition
M17.5 is a billable ICD-10-CM diagnosis code for other unilateral secondary osteoarthritis of knee. 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 left knee joint. 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 knee.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Osteoarthritis of left knee joint
- Osteoarthritis of right knee joint
- Secondary osteoarthritis of knee joint
- Secondary osteoarthritis of left knee
- Secondary osteoarthritis of right knee
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M17.5: 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.
- Disorders affecting predominantly peripheral (limb) joints
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Secondary osteoarthritis of knee NOS
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 M17.5, its category, or a range that includes it.
Excludes1 5
These codes carry an Excludes1 note naming M17.5: they are not reported together with it, unless the two conditions are unrelated.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
secondary NEC M17.5
knee M17.5
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Osteoarthritis, Knee
noninflammatory degenerative disease of the knee joint consisting of three large categories: conditions that block normal synchronous movement, conditions that produce abnormal pathways of motion, and conditions that cause stress concentration resulting in changes to articular cartilage. (crenshaw, campbell's operative orthopaedics, 8th ed, p2019)
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 M17.5 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M17.5Overview
What is the ICD-10 code for other unilateral secondary osteoarthritis of knee?
The ICD-10-CM code for other unilateral secondary osteoarthritis of knee is M17.5 (sometimes written as M175). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M17.5 (Osteoarthritis of knee) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other unilateral secondary osteoarthritis of knee on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M17.5 group to?
When other unilateral secondary osteoarthritis of knee 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 M17.5?
Under the General Equivalence Mappings, other unilateral secondary osteoarthritis of knee converts to ICD-9-CM 715.26 (loc 2nd osteoarthr-l/leg). The mapping is approximate, so confirm the match fits the documentation.
