2026 ICD-10-CM Diagnosis Code D38.1Neoplasm of uncertain behavior of trachea, bronchus and lung
ICD-10-CM Codes›C00–D49›D37-D48›D38
- Billable — Valid for Submission
- Not Chronic
D38.1 is a billable ICD-10-CM diagnosis code for neoplasm of uncertain behavior of trachea, bronchus and lung. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 180 through 182. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neoplasms of unspecified nature or uncertain behavior.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Carcinoid tumor of lung
- Diffuse pulmonary neurofibromatosis
- Epithelioid hemangioendothelioma
- Epithelioid hemangioendothelioma of lung
- Hemangioblastoma of lung
- Hilar mass
- Intrapulmonary teratoma
- Neoplasm of blood vessel of thorax
- Neoplasm of bronchus of left lower lobe
- Neoplasm of bronchus of left upper lobe
- Neoplasm of bronchus of middle lobe of right lung
- Neoplasm of bronchus of right lower lobe
- Neoplasm of bronchus of right upper lobe
- Neoplasm of carina
- Neoplasm of hilus of lung
- Neoplasm of lower respiratory tract and mediastinum
- Neoplasm of uncertain behavior of bronchus
- Neoplasm of uncertain behavior of bronchus of left lower lobe
- Neoplasm of uncertain behavior of bronchus of left upper lobe
- Neoplasm of uncertain behavior of bronchus of middle lobe of right lung
- Neoplasm of uncertain behavior of bronchus of right lower lobe
- Neoplasm of uncertain behavior of bronchus of right upper lobe
- Neoplasm of uncertain behavior of carina
- Neoplasm of uncertain behavior of hilus of lung
- Neoplasm of uncertain behavior of left lower lobe of lung
- Neoplasm of uncertain behavior of left upper lobe of lung
- Neoplasm of uncertain behavior of lung
- Neoplasm of uncertain behavior of main bronchus
- Neoplasm of uncertain behavior of middle lobe of right lung
- Neoplasm of uncertain behavior of right lower lobe of lung
- Neoplasm of uncertain behavior of right upper lobe of lung
- Neoplasm of uncertain behavior of trachea
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- pulmonary - D38.1
- Tumor - See Also: Neoplasm, unspecified behavior, by site;
- bronchial alveolar, intravascular - D38.1
- intravascular bronchial alveolar - D38.1
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Adenoma
- bronchial
- Adenomatosis
- pulmonary
- Tumor
- bronchial alveolar, intravascular
- Tumor
- intravascular bronchial alveolar
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Table of NeoplasmsClinical
Anatomical sites in the Table of Neoplasms that reference this code family.
| Site | Malig. Primary | Malig. Secondary | Ca in situ | Benign | Uncertain | Unspec. |
|---|---|---|---|---|---|---|
| bronchiogenic, bronchogenic (lung) | C34.9 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| bronchiole | C34.9 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| bronchus | C34.9 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| bronchus › carina | C34.0 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| bronchus › lower lobe of lung | C34.3 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| bronchus › main | C34.0 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| bronchus › middle lobe of lung | C34.2 | C78.0 | D02.21 | D14.31 | D38.1 | D49.1 |
| bronchus › upper lobe of lung | C34.1 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| carina (bronchus) | C34.0 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| cartilage (articular) (joint) NEC [See Also: Neoplasm, bone] › bronchi | C34.0 | C78.39 | – | D14.3 | D38.1 | D49.1 |
| cartilage (articular) (joint) NEC [See Also: Neoplasm, bone] › trachea | C33 | C78.39 | D02.1 | D14.2 | D38.1 | D49.1 |
| hilus of lung | C34.0 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| lingula, lung | C34.1 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| lung | C34.9 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| lung › azygos lobe | C34.1 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| lung › carina | C34.0 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| lung › hilus | C34.0 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| lung › lingula | C34.1 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| lung › lobe NEC | C34.9 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| lung › lower lobe | C34.3 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| lung › main bronchus | C34.0 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| lung › middle lobe | C34.2 | C78.0 | D02.21 | D14.31 | D38.1 | D49.1 |
| lung › upper lobe | C34.1 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| pulmonary [See Also: Neoplasm, lung] | C34.9 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| subpleural | C34.9 | C78.0 | D02.2 | D14.3 | D38.1 | D49.1 |
| trachea (cartilage) (mucosa) | C33 | C78.39 | D02.1 | D14.2 | D38.1 | D49.1 |
| tracheobronchial | C34.8 | C78.39 | D02.1 | D14.2 | D38.1 | D49.1 |
| windpipe | C33 | C78.39 | D02.1 | D14.2 | D38.1 | D49.1 |
Patient EducationClinical
Bronchial Disorders
When you breathe in, the air travels down through your trachea (windpipe). It then goes through two tubes to your lungs. These tubes are your bronchi. Bronchial disorders can make it hard for you to breathe.
Read the full article at MedlinePlus
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Convert D38.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About D38.1Overview
Is D38.1 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report neoplasm of uncertain behavior of trachea, bronchus and lung on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does D38.1 group to?
When neoplasm of uncertain behavior of trachea, bronchus and lung is the principal diagnosis on an inpatient stay, it groups to MS-DRG 180, 181, 182, with relative weights from 0.7440 to 1.7660 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of D38.1?
Under the General Equivalence Mappings, neoplasm of uncertain behavior of trachea, bronchus and lung converts to ICD-9-CM 235.7 (unc behav neo lung). The mapping is a direct match.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
