M36.4 Arthropathy in hypersensitivity reactions classified elsewhere

Billable ICD-10-CM code, FY2026.

Code first

• underlying disease, such as:
• Henoch (-Schönlein) purpura (D69.0)
• serum sickness (T80.6-)

Applies from M36 Systemic disorders of connective tissue in diseases classified elsewhere

Excludes2 (not included here)

• arthropathies in diseases classified elsewhere (M14.-)

MS-DRG index

Defines the logic of DRG(s) 553-554 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 713.6 Arthropathy associated with hypersensitivity reaction (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.

Code annotations containing back-references to M36.4

Back-references to M36.4

• Type 1 Excludes: M14 Arthropathies in other diseases classified elsewhere ("hypersensitivity reactions (M36.4)")
• Code Also: T80.69 Other serum reaction due to other serum (", if applicable, arthropathy in hypersensitivity reactions classified elsewhere (M36.4)")

Back-references to M36

• Type 2 Excludes: I77 Other disorders of arteries and arterioles ("collagen (vascular) diseases (M30-M36)")
• Type 2 Excludes: J82 Pulmonary eosinophilia, not elsewhere classified ("pulmonary eosinophilia due to systemic connective tissue disorders (M30-M36)")
• Code First: J84.170 Interstitial lung disease with progressive fibrotic phenotype in diseases classified elsewhere ("systemic connective tissue disorders (M30-M36)")
• Type 1 Excludes: L94 Other localized connective tissue disorders ("systemic connective tissue disorders (M30-M36)")

Diagnosis Index entries for M36.4

• Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › due to or associated with › Henoch- (Schönlein) purpura
• Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › in (due to) › Henoch (-Schönlein) purpura
• Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › in (due to) › hypersensitivity reaction NEC
• Arthropathy › in (due to) › Henoch-Schönlein purpura

Nearby codes

• M36 Systemic disorders of connective tissue in diseases classified elsewhere
• M36.0 Dermato(poly)myositis in neoplastic disease
• M36.1 Arthropathy in neoplastic disease
• M36.2 Hemophilic arthropathy
• M36.3 Arthropathy in other blood disorders
• M36.4 Arthropathy in hypersensitivity reactions classified elsewhere (this code)
• M36.8 Systemic disorders of connective tissue in other diseases classified elsewhere