M33.21

Polymyositis with respiratory involvement

Risk-adjusting (HCC)Billable code

HCC risk adjustment mapping

CMS-HCC V28

HCC93

Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders

HCC280

Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders

CMS-HCC ESRD V24

HCC40

Rheumatoid Arthritis and Inflammatory Connective Tissue Disease

HCC112

Fibrosis of Lung and Other Chronic Lung Disorders

RxHCC V08

RXHCC83

Rheumatoid Arthritis and Other Inflammatory Polyarthropathy

RXHCC227

Pulmonary Fibrosis, Except Idiopathic

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

Inherited from M30-M36Systemic connective tissue disorders
Includes

autoimmune disease NOS collagen (vascular) disease NOS systemic autoimmune disease systemic collagen (vascular) disease

Excludes 1

autoimmune disease, single organ or single cell-type -code to relevant condition category

Inherited from chapter 13Diseases of the musculoskeletal system and connective tissue
Excludes 2

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)

Note

Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition (M00-M25) Arthropathies (M00-M25) Includes: Disorders affecting predominantly peripheral (limb) joints (M40-M54) Dorsopathies (M40-M54) (M60-M79) Soft tissue disorders (M60-M79) (M80-M94) Osteopathies and chondropathies (M80-M94)

Official Guidelines for M33.21

FY 2026 ›

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