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ICD-10-CM 2027

ICD-10 code for arthritis

M19.90

Unspecified osteoarthritis, unspecified site

✓ Billable / specific

From the official ICD-10-CM alphabetic index entry “Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute)”. Page updated September 29, 2026.

About coding arthritis

The ICD-10-CM code for arthritis is M19.90 (Unspecified osteoarthritis, unspecified site). The official index lists 217+ more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M19.90.

Within M19.9, choose M19.90 (Unspecified osteoarthritis, unspecified site) only when documentation doesn't support a more specific option: primary osteoarthritis, unspecified site (M19.91), post-traumatic osteoarthritis, unspecified site (M19.92) and secondary osteoarthritis, unspecified site (M19.93).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 553 (Bone Diseases and Arthropathies with MCC, relative weight 1.2494) and DRG 554 (Bone Diseases and Arthropathies without MCC, relative weight 0.8331), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

More specific arthritis codes (official index)

  • allergic
  • ankylosing (crippling) (spine)
  • sites other than spine
  • atrophic
  • spine
  • back
  • blennorrhagic (gonococcal) A54.42 — Gonococcal arthritis
  • Charcot's
  • diabetic
  • syringomyelic G95.0 — Syringomyelia and syringobulbia
  • chylous (filarial) B74.9 — Filariasis, unspecified
  • climacteric (any site) NEC
  • crystal (-induced)
  • deformans
  • degenerative
  • due to or associated with
  • acromegaly E22.0 — Acromegaly and pituitary gigantism
  • brucellosis
  • caisson disease T70.3 — Caisson disease [decompression sickness]
  • diabetes
  • dracontiasis B72 — Dracunculiasis
  • enteritis NEC
  • regional
  • erysipelas A46 — Erysipelas
  • erythema
  • epidemic A25.1 — Streptobacillosis
  • nodosum L52 — Erythema nodosum
  • filariasis NOS B74.9 — Filariasis, unspecified
  • glanders A24.0 — Glanders
  • helminthiasis B83.9 — Helminthiasis, unspecified
  • hemophilia D66 — Hereditary factor VIII deficiency
  • Henoch- (Schönlein) purpura D69.0 — Allergic purpura
  • human parvovirus B97.6 — Parvovirus as the cause of diseases classified elsewhere
  • infectious disease NEC
  • leprosy (see also category M01) A30.9 — Leprosy, unspecified
  • Lyme disease A69.23 — Arthritis due to Lyme disease
  • mycobacteria A31.8 — Other mycobacterial infections
  • parasitic disease NEC B89 — Unspecified parasitic disease
  • paratyphoid fever (see also category M01) A01.4 — Paratyphoid fever, unspecified
  • rat bite fever A25.1 — Streptobacillosis
  • regional enteritis
  • respiratory disorder NOS J98.9 — Respiratory disorder, unspecified
  • serum sickness T80.69 — Other serum reaction due to other serum
  • syringomyelia G95.0 — Syringomyelia and syringobulbia
  • typhoid fever A01.04 — Typhoid arthritis
  • epidemic erythema A25.1 — Streptobacillosis
  • facet joint M47.819 — Spondylosis without myelopathy or radiculopathy, site unspecified
  • febrile
  • gonococcal A54.42 — Gonococcal arthritis
  • gouty (acute)
  • in (due to)
  • acromegaly E22.0 — Acromegaly and pituitary gigantism
  • amyloidosis E85.4 — Organ-limited amyloidosis
  • bacterial disease A49.9 — Bacterial infection, unspecified
  • Behçet's syndrome M35.2 — Behcet's disease
  • caisson disease T70.3 — Caisson disease [decompression sickness]
  • coliform bacilli (Escherichia coli)
  • crystals M11.9 — Crystal arthropathy, unspecified
  • dicalcium phosphate
  • hydroxyapatite M11.0 — Hydroxyapatite deposition disease
  • pyrophosphate
  • specified type NEC M11.80 — Other specified crystal arthropathies, unspecified site
  • ankle M11.87 — Other specified crystal arthropathies, ankle and foot
  • elbow M11.82 — Other specified crystal arthropathies, elbow
  • foot joint M11.87 — Other specified crystal arthropathies, ankle and foot
  • hand joint M11.84 — Other specified crystal arthropathies, hand
  • hip M11.85 — Other specified crystal arthropathies, hip
  • knee M11.86 — Other specified crystal arthropathies, knee
  • multiple sites M11.89 — Other specified crystal arthropathies, multiple sites
  • shoulder M11.81 — Other specified crystal arthropathies, shoulder
  • vertebrae M11.88 — Other specified crystal arthropathies, vertebrae
  • wrist M11.83 — Other specified crystal arthropathies, wrist
  • dermatoarthritis, lipoid E78.81 — Lipoid dermatoarthritis
  • dracontiasis (dracunculiasis) B72 — Dracunculiasis
  • endocrine disorder NEC E34.9 — Endocrine disorder, unspecified
  • enteritis, infectious NEC A09 — Infectious gastroenteritis and colitis, unspecified
  • specified organism NEC A08.8 — Other specified intestinal infections
  • erythema
  • multiforme L51.9 — Erythema multiforme, unspecified
  • nodosum L52 — Erythema nodosum
  • gout
  • helminthiasis NEC B83.9 — Helminthiasis, unspecified
  • hemochromatosis E83.118 — Other hemochromatosis
  • hemoglobinopathy NEC D58.2 — Other hemoglobinopathies
  • hemophilia NEC D66 — Hereditary factor VIII deficiency
  • Hemophilus influenzae M00.8 — Arthritis and polyarthritis due to other bacteria
  • Henoch (-Schönlein) purpura D69.0 — Allergic purpura
  • hyperparathyroidism NEC E21.3 — Hyperparathyroidism, unspecified
  • hypersensitivity reaction NEC T78.49 — Other allergy
  • hypogammaglobulinemia D80.1 — Nonfamilial hypogammaglobulinemia
  • hypothyroidism NEC E03.9 — Hypothyroidism, unspecified
  • infection
  • spine
  • infectious disease NEC
  • leprosy A30.9 — Leprosy, unspecified
  • leukemia NEC C95.9 — Leukemia, unspecified
  • lipoid dermatoarthritis E78.81 — Lipoid dermatoarthritis
  • Lyme disease A69.23 — Arthritis due to Lyme disease
  • Mediterranean fever, familial M04.1 — Periodic fever syndromes
  • Meningococcus A39.83 — Meningococcal arthritis
  • metabolic disorder NEC E88.9 — Metabolic disorder, unspecified
  • multiple myelomatosis C90.0 — Multiple myeloma
  • mumps B26.85 — Mumps arthritis
  • mycosis NEC B49 — Unspecified mycosis
  • myelomatosis (multiple) C90.0 — Multiple myeloma
  • neurological disorder NEC G98.0 — Neurogenic arthritis, not elsewhere classified
  • ochronosis E70.29 — Other disorders of tyrosine metabolism
  • O'nyong-nyong A92.1 — O'nyong-nyong fever
  • parasitic disease NEC B89 — Unspecified parasitic disease
  • paratyphoid fever A01.4 — Paratyphoid fever, unspecified
  • Pseudomonas
  • psoriasis L40.50 — Arthropathic psoriasis, unspecified
  • pyogenic organism NEC
  • Reiter's disease
  • respiratory disorder NEC J98.9 — Respiratory disorder, unspecified
  • reticulosis, malignant C86.0 — Extranodal NK/T-cell lymphoma, nasal type
  • rubella B06.82 — Rubella arthritis
  • Salmonella (arizonae) (cholerae-suis) (enteritidis) (typhimurium) A02.23 — Salmonella arthritis
  • sarcoidosis D86.86 — Sarcoid arthropathy
  • specified bacteria NEC
  • sporotrichosis B42.82 — Sporotrichosis arthritis
  • syringomyelia G95.0 — Syringomyelia and syringobulbia
  • thalassemia NEC D56.9 — Thalassemia, unspecified
  • tuberculosis
  • typhoid fever A01.04 — Typhoid arthritis
  • urethritis, Reiter's
  • viral disease NEC B34.9 — Viral infection, unspecified
  • infectious or infective
  • spine
  • juvenile M08.90 — Juvenile arthritis, unspecified, unspecified site
  • with systemic onset
  • ankle M08.97 — Juvenile arthritis, unspecified, ankle and foot
  • elbow M08.92 — Juvenile arthritis, unspecified, elbow
  • foot joint M08.97 — Juvenile arthritis, unspecified, ankle and foot
  • hand joint M08.94 — Juvenile arthritis, unspecified, hand
  • hip M08.95 — Juvenile arthritis, unspecified, hip
  • knee M08.96 — Juvenile arthritis, unspecified, knee
  • multiple site M08.99 — Juvenile arthritis, unspecified, multiple sites
  • pauciarticular M08.40 — Pauciarticular juvenile rheumatoid arthritis, unspecified site
  • ankle M08.47 — Pauciarticular juvenile rheumatoid arthritis, ankle and foot
  • elbow M08.42 — Pauciarticular juvenile rheumatoid arthritis, elbow
  • foot joint M08.47 — Pauciarticular juvenile rheumatoid arthritis, ankle and foot
  • hand joint M08.44 — Pauciarticular juvenile rheumatoid arthritis, hand
  • hip M08.45 — Pauciarticular juvenile rheumatoid arthritis, hip
  • knee M08.46 — Pauciarticular juvenile rheumatoid arthritis, knee
  • shoulder M08.41 — Pauciarticular juvenile rheumatoid arthritis, shoulder
  • specified site NEC M08.4A — Pauciarticular juvenile rheumatoid arthritis, other specified site
  • vertebrae M08.48 — Pauciarticular juvenile rheumatoid arthritis, vertebrae
  • wrist M08.43 — Pauciarticular juvenile rheumatoid arthritis, wrist
  • psoriatic L40.54 — Psoriatic juvenile arthropathy
  • rheumatoid
  • shoulder M08.91 — Juvenile arthritis, unspecified, shoulder
  • specified site NEC M08.9A — Juvenile arthritis, unspecified, other specified site
  • vertebra M08.98 — Juvenile arthritis, unspecified, vertebrae
  • specified type NEC M08.80 — Other juvenile arthritis, unspecified site
  • ankle M08.87 — Other juvenile arthritis, ankle and foot
  • elbow M08.82 — Other juvenile arthritis, elbow
  • foot joint M08.87 — Other juvenile arthritis, ankle and foot
  • hand joint M08.84 — Other juvenile arthritis, hand
  • hip M08.85 — Other juvenile arthritis, hip
  • knee M08.86 — Other juvenile arthritis, knee
  • multiple site M08.89 — Other juvenile arthritis, multiple sites
  • shoulder M08.81 — Other juvenile arthritis, shoulder
  • specified joint NEC M08.88 — Other juvenile arthritis, other specified site
  • vertebrae M08.88 — Other juvenile arthritis, other specified site
  • wrist M08.83 — Other juvenile arthritis, wrist
  • wrist M08.93 — Juvenile arthritis, unspecified, wrist
  • meaning osteoarthritis
  • meningococcal A39.83 — Meningococcal arthritis
  • menopausal (any site) NEC
  • mutilans (psoriatic) L40.52 — Psoriatic arthritis mutilans
  • mycotic NEC B49 — Unspecified mycosis
  • neuropathic (Charcot)
  • diabetic
  • nonsyphilitic NEC G98.0 — Neurogenic arthritis, not elsewhere classified
  • syringomyelic G95.0 — Syringomyelia and syringobulbia
  • ochronotic E70.29 — Other disorders of tyrosine metabolism
  • palindromic (any site)
  • pneumococcal M00.10 — Pneumococcal arthritis, unspecified joint
  • ankle M00.17 — Pneumococcal arthritis, ankle and foot
  • elbow M00.12 — Pneumococcal arthritis, elbow
  • foot joint
  • hand joint M00.14 — Pneumococcal arthritis, hand
  • hip M00.15 — Pneumococcal arthritis, hip
  • knee M00.16 — Pneumococcal arthritis, knee
  • multiple site M00.19 — Pneumococcal polyarthritis
  • shoulder M00.11 — Pneumococcal arthritis, shoulder
  • vertebra M00.18 — Pneumococcal arthritis, vertebrae
  • wrist M00.13 — Pneumococcal arthritis, wrist
  • postdysenteric
  • postmeningococcal A39.84 — Postmeningococcal arthritis
  • postrheumatic, chronic
  • primary progressive
  • spine
  • psoriatic L40.50 — Arthropathic psoriasis, unspecified
  • purulent (any site except spine)
  • spine
  • pyogenic or pyemic (any site except spine) M00.9 — Pyogenic arthritis, unspecified
  • bacterial NEC M00.80 — Arthritis due to other bacteria, unspecified joint
  • ankle M00.87 — Arthritis due to other bacteria, ankle and foot
  • elbow M00.82 — Arthritis due to other bacteria, elbow
  • foot joint
  • hand joint M00.84 — Arthritis due to other bacteria, hand
  • hip M00.85 — Arthritis due to other bacteria, hip
  • knee M00.86 — Arthritis due to other bacteria, knee
  • multiple site M00.89 — Polyarthritis due to other bacteria
  • shoulder M00.81 — Arthritis due to other bacteria, shoulder
  • vertebra M00.88 — Arthritis due to other bacteria, vertebrae
  • wrist M00.83 — Arthritis due to other bacteria, wrist
  • pneumococcal
  • spine
  • staphylococcal
  • streptococcal
  • pneumococcal
  • reactive
  • rheumatic
  • acute or subacute
  • rheumatoid M06.9 — Rheumatoid arthritis, unspecified
  • with
  • carditis
  • endocarditis
  • heart involvement NEC
  • lung involvement
  • myocarditis
  • myopathy
  • pericarditis
  • polyneuropathy
  • rheumatoid factor
  • splenoadenomegaly and leukopenia
  • vasculitis
  • visceral involvement NEC
  • juvenile (with or without rheumatoid factor) M08.00 — Unspecified juvenile rheumatoid arthritis of unspecified site
  • with systemic onset
  • ankle M08.07 — Unspecified juvenile rheumatoid arthritis, ankle and foot
  • elbow M08.02 — Unspecified juvenile rheumatoid arthritis of elbow
  • foot joint M08.07 — Unspecified juvenile rheumatoid arthritis, ankle and foot
  • hand joint M08.04 — Unspecified juvenile rheumatoid arthritis, hand
  • hip M08.05 — Unspecified juvenile rheumatoid arthritis, hip
  • knee M08.06 — Unspecified juvenile rheumatoid arthritis, knee
  • multiple site M08.09 — Unspecified juvenile rheumatoid arthritis, multiple sites
  • shoulder M08.01 — Unspecified juvenile rheumatoid arthritis, shoulder
  • specified site NEC M08.0A — Unspecified juvenile rheumatoid arthritis, other specified site
  • vertebra M08.08 — Unspecified juvenile rheumatoid arthritis, vertebrae
  • wrist M08.03 — Unspecified juvenile rheumatoid arthritis, wrist
  • seronegative M06.00 — Rheumatoid arthritis without rheumatoid factor, unspecified site
  • ankle M06.07 — Rheumatoid arthritis without rheumatoid factor, ankle and foot
  • elbow M06.02 — Rheumatoid arthritis without rheumatoid factor, elbow
  • foot joint M06.07 — Rheumatoid arthritis without rheumatoid factor, ankle and foot
  • hand joint M06.04 — Rheumatoid arthritis without rheumatoid factor, hand
  • hip M06.05 — Rheumatoid arthritis without rheumatoid factor, hip
  • knee M06.06 — Rheumatoid arthritis without rheumatoid factor, knee
  • multiple site M06.09 — Rheumatoid arthritis without rheumatoid factor, multiple sites
  • shoulder M06.01 — Rheumatoid arthritis without rheumatoid factor, shoulder
  • specified site NEC M06.0A — Rheumatoid arthritis without rheumatoid factor, other specified site
  • vertebra M06.08 — Rheumatoid arthritis without rheumatoid factor, vertebrae
  • wrist M06.03 — Rheumatoid arthritis without rheumatoid factor, wrist
  • seropositive M05.9 — Rheumatoid arthritis with rheumatoid factor, unspecified
  • specified NEC M05.80 — Other rheumatoid arthritis with rheumatoid factor of unspecified site
  • ankle M05.87 — Other rheumatoid arthritis with rheumatoid factor of ankle and foot
  • elbow M05.82 — Other rheumatoid arthritis with rheumatoid factor of elbow
  • foot joint M05.87 — Other rheumatoid arthritis with rheumatoid factor of ankle and foot
  • hand joint M05.84 — Other rheumatoid arthritis with rheumatoid factor of hand
  • hip M05.85 — Other rheumatoid arthritis with rheumatoid factor of hip
  • knee M05.86 — Other rheumatoid arthritis with rheumatoid factor of knee
  • multiple sites M05.89 — Other rheumatoid arthritis with rheumatoid factor of multiple sites
  • shoulder M05.81 — Other rheumatoid arthritis with rheumatoid factor of shoulder
  • specified site NEC M05.8A — Other rheumatoid arthritis with rheumatoid factor of other specified site
  • vertebra
  • wrist M05.83 — Other rheumatoid arthritis with rheumatoid factor of wrist
  • without organ involvement M05.70 — Rheumatoid arthritis with rheumatoid factor of unspecified site without organ or systems involvement
  • ankle M05.77 — Rheumatoid arthritis with rheumatoid factor of ankle and foot without organ or systems involvement
  • elbow M05.72 — Rheumatoid arthritis with rheumatoid factor of elbow without organ or systems involvement
  • foot joint M05.77 — Rheumatoid arthritis with rheumatoid factor of ankle and foot without organ or systems involvement
  • hand joint M05.74 — Rheumatoid arthritis with rheumatoid factor of hand without organ or systems involvement
  • hip M05.75 — Rheumatoid arthritis with rheumatoid factor of hip without organ or systems involvement
  • knee M05.76 — Rheumatoid arthritis with rheumatoid factor of knee without organ or systems involvement
  • multiple sites M05.79 — Rheumatoid arthritis with rheumatoid factor of multiple sites without organ or systems involvement
  • shoulder M05.71 — Rheumatoid arthritis with rheumatoid factor of shoulder without organ or systems involvement
  • specified site NEC M05.7A — Rheumatoid arthritis with rheumatoid factor of other specified site without organ or systems involvement
  • vertebra
  • wrist M05.73 — Rheumatoid arthritis with rheumatoid factor of wrist without organ or systems involvement
  • specified type NEC M06.80 — Other specified rheumatoid arthritis, unspecified site
  • ankle M06.87 — Other specified rheumatoid arthritis, ankle and foot
  • elbow M06.82 — Other specified rheumatoid arthritis, elbow
  • foot joint M06.87 — Other specified rheumatoid arthritis, ankle and foot
  • hand joint M06.84 — Other specified rheumatoid arthritis, hand
  • hip M06.85 — Other specified rheumatoid arthritis, hip
  • knee M06.86 — Other specified rheumatoid arthritis, knee
  • multiple site M06.89 — Other specified rheumatoid arthritis, multiple sites
  • shoulder M06.81 — Other specified rheumatoid arthritis, shoulder
  • specified site NEC M06.8A — Other specified rheumatoid arthritis, other specified site
  • vertebra M06.88 — Other specified rheumatoid arthritis, vertebrae
  • wrist M06.83 — Other specified rheumatoid arthritis, wrist
  • spine
  • rubella B06.82 — Rubella arthritis
  • scorbutic E54 — Ascorbic acid deficiency
  • senile or senescent
  • septic (any site except spine)
  • spine
  • serum (nontherapeutic) (therapeutic)

See all 354 entries in the alphabetic index

Common questions about arthritis ICD-10 codes

What is the ICD-10 code for arthritis?

M19.90 — Unspecified osteoarthritis, unspecified site. More specific codes apply when the documentation supports them: A54.42, G95.0, B74.9, E22.0 and others below.

What is the ICD-10 code for blennorrhagic arthritis?

A54.42 — Gonococcal arthritis.

What is the ICD-10 code for chylous arthritis?

B74.9 — Filariasis, unspecified.

What is the ICD-10 code for epidemic erythema arthritis?

A25.1 — Streptobacillosis.

What is the ICD-10 code for facet joint arthritis?

M47.819 — Spondylosis without myelopathy or radiculopathy, site unspecified.

What is the ICD-10 code for gonococcal arthritis?

A54.42 — Gonococcal arthritis.

What is the ICD-10 code for juvenile arthritis?

M08.90 — Juvenile arthritis, unspecified, unspecified site.

Is M19.90 billable?

Yes. M19.90 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can M19.90 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict M19.90 as a principal diagnosis.

Is M19.90 a CC or MCC?

No. M19.90 is neither a CC nor an MCC under MS-DRG v44.0.