2027 ICD-10-CM Diagnosis Code M19.90Unspecified osteoarthritis, unspecified site
ICD-10-CM Codes›M00–M99›M15-M19›M19
- Billable — Valid for Submission
- Chronic Condition
M19.90 is a billable ICD-10-CM diagnosis code for unspecified osteoarthritis, unspecified site. 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.
- Advanced bone age
- Aneurysm osteoarthritis syndrome
- Arthritis
- Arthritis co-occurrent and due to Crohn's disease
- Arthritis of left sacroiliac joint
- Arthritis of left sternoclavicular joint
- Arthritis of left temporomandibular joint
- Arthritis of right sacroiliac joint
- Arthritis of right sternoclavicular joint
- Arthritis of right temporomandibular joint
- Bilateral arthritis of sacroiliac joint
- Bilateral arthritis of sternoclavicular joints
- Bilateral arthropathy of sacroiliac joints
- Bilateral osteoarthritis of sacroiliac joints
- Bilateral osteoarthritis of sternoclavicular joints
- Bilateral osteoarthritis of temporomandibular joints
- Bilateral sacroiliitis
- Bilateral shoulder osteoarthritis
- Bilateral temporomandibular joint arthritis
- Bone age finding
- Chronic osteoarthritis
- Degenerative polyarthritis
- Endemic osteoarthritis
- Exacerbation of osteoarthritis
- Extraintestinal Crohn's
- Inflammation of elbow joint
- Inflammation of joint
- Inflammation of metatarsophalangeal joint
- Inflammation of wrist joint
- Localized osteoarthrosis
- Localized osteoarthrosis uncertain if primary OR secondary
- Malemud disease
- Mild spondyloepiphyseal dysplasia due to COL2A1 mutation with early onset osteoarthritis
- Oligoarticular joint involvement
- Oligoosteoarthritis
- Opera glass deformity of hands
- Osteoarthritis
- Osteoarthritis of joint of left shoulder region
- Osteoarthritis of joint of right shoulder region
- Osteoarthritis of left sacroiliac joint
- Osteoarthritis of left sternoclavicular joint
- Osteoarthritis of left temporomandibular joint
- Osteoarthritis of multiple joints
- Osteoarthritis of pelvis
- Osteoarthritis of right sacroiliac joint
- Osteoarthritis of right sternoclavicular joint
- Osteoarthritis of right temporomandibular joint
- Osteoarthritis of spinal facet joint
- Osteoarthritis of spine
- Osteoarthritis of temporomandibular joint
- Pain due to arthritis
- Sacroiliitis of left sacroiliac joint
- Sacroiliitis of right sacroiliac joint
- Short stature, advanced bone age, early-onset osteoarthritis syndrome
- Undifferentiated inflammatory arthritis
- Undifferentiated inflammatory oligoarthritis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M19.90: 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
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.
- Arthrosis NOS
- Arthritis NOS
- Osteoarthritis NOS
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 M19.90, its category, or a range that includes it.
Excludes1 5
These codes carry an Excludes1 note naming M19.90: 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.
Arthrosis (deformans) (degenerative) (localized) See Also: Osteoarthritis; M19.90
Osteoarthritis M19.90
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Arthritis
acute or chronic inflammation of joints.Osteoarthritis
a progressive, degenerative joint disease, the most common form of arthritis, especially in older persons. the disease is thought to result not from the aging process but from biochemical changes and biomechanical stresses affecting articular cartilage. in the foreign literature it is often called osteoarthrosis deformans.
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 M19.90 to ICD-9-CMHistory
Code HistoryHistory
Questions About M19.90Overview
What is the ICD-10 code for unspecified osteoarthritis, unspecified site?
The ICD-10-CM code for unspecified osteoarthritis, unspecified site is M19.90 (sometimes written as M1990). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M19.90 (Osteoarthritis, unspecified site) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified osteoarthritis, unspecified site on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M19.90 group to?
When unspecified osteoarthritis, unspecified site 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 M19.90 be reported with a code from M15?
Not as a rule. The Excludes1 note at M19, which applies to M19.90, 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 M19.90?
Under the General Equivalence Mappings, unspecified osteoarthritis, unspecified site converts to ICD-9-CM 715.30 (loc osteoarth NOS-unspec) and 715.90 (osteoarthros NOS-unspec). The mapping is approximate, so confirm the match fits the documentation.
