D49.1 Neoplasm of unspecified behavior of respiratory system

Billable ICD-10-CM code, FY2026.

Applies from D49 Neoplasms of unspecified behavior

Includes

• 'growth' NOS
• neoplasm NOS
• new growth NOS
• tumor NOS

Excludes1 (never code together)

• neoplasms of uncertain behavior (D37-D44, D48)

Notes

• Category D49 classifies by site neoplasms of unspecified morphology and behavior. The term 'mass', unless otherwise stated, is not to be regarded as a neoplastic growth.

MS-DRG index

Defines the logic of DRG(s) 180-182 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 239.1 Neoplasm of unspecified nature of respiratory system

Code annotations containing back-references to D49.1

Back-references to D49.1

• Type 1 Excludes: D49.2 Neoplasm of unspecified behavior of bone, soft tissue, and skin ("neoplasm of unspecified behavior of cartilage of larynx (D49.1)")
• Type 1 Excludes: D49.2 Neoplasm of unspecified behavior of bone, soft tissue, and skin ("neoplasm of unspecified behavior of cartilage of nose (D49.1)")

Back-references to D49

• Code First: D63.0 Anemia in neoplastic disease ("neoplasm (C00-D49)")
• Code First: G13.0 Paraneoplastic neuromyopathy and neuropathy ("underlying neoplasm (C00-D49)")
• Code First: G13.1 Other systemic atrophy primarily affecting central nervous system in neoplastic disease ("underlying neoplasm (C00-D49)")
• Code First: G32.8 Other specified degenerative disorders of nervous system in diseases classified elsewhere ("cerebral degeneration (due to) neoplasm (C00-D49)")
• Code First: G32.81 Cerebellar ataxia in diseases classified elsewhere ("cerebellar ataxia (in) neoplastic disease (paraneoplastic cerebellar degeneration) (C00-D49)")
• Code First: G53 Cranial nerve disorders in diseases classified elsewhere ("neoplasm (C00-D49)")
• Code First: G55 Nerve root and plexus compressions in diseases classified elsewhere ("neoplasm (C00-D49)")
• Code First: G63 Polyneuropathy in diseases classified elsewhere ("neoplasm (C00-D49)")
• Code First: G73.1 Lambert-Eaton syndrome in neoplastic disease ("underlying neoplasm (C00-D49)")
• Code First: G73.3 Myasthenic syndromes in other diseases classified elsewhere ("neoplasm (C00-D49)")
• Code First: G91.4 Hydrocephalus in diseases classified elsewhere ("neoplasm (C00-D49)")
• Code First: G99.2 Myelopathy in diseases classified elsewhere ("neoplasm (C00-D49)")
• Code First: I31.31 Malignant pericardial effusion in diseases classified elsewhere ("underlying neoplasm (C00-D49)")
• Code First: J91.0 Malignant pleural effusion ("underlying neoplasm (C00-D49)")
• Code First: M36.0 Dermato(poly)myositis in neoplastic disease ("underlying neoplasm (C00-D49)")

Nearby codes

• D49 Neoplasms of unspecified behavior
• D49.0 Neoplasm of unspecified behavior of digestive system
• D49.1 Neoplasm of unspecified behavior of respiratory system (this code)
• D49.2 Neoplasm of unspecified behavior of bone, soft tissue, and skin
• D49.3 Neoplasm of unspecified behavior of breast
• D49.4 Neoplasm of unspecified behavior of bladder
• D49.5 Neoplasm of unspecified behavior of other genitourinary organs
• D49.51 Neoplasm of unspecified behavior of kidney