2027 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 2027 (October 1, 2026 through September 30, 2027) 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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to D38.1: its own notes plus those printed at D38, block D37-D48, and Chapter 2. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- neoplasm of uncertain behavior of heart (D48.7)
- neoplasms of unspecified behavior (D49.-)
Notes
General instructions on how these codes are used.
- Functional activity
- All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
- Morphology [Histology]
- Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
- Primary malignant neoplasms overlapping site boundaries
- A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
- Malignant neoplasm of ectopic tissue
- Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name D38.1, its category, or a range that includes it.
Excludes2 1
These codes carry an Excludes2 note naming D38.1: its condition is not part of those codes, and both may be reported when the patient has both.
- D49 Neoplasms of unspecified behavior
Notes 1
These notes mention D38.1.
- Block D37-D48 Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes
Index to Diseases and InjuriesGuidance
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.
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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
What is the ICD-10 code for neoplasm of uncertain behavior of trachea, bronchus and lung?
The ICD-10-CM code for neoplasm of uncertain behavior of trachea, bronchus and lung is D38.1 (sometimes written as D381). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
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 181, 180, 182, with relative weights from 0.7436 to 1.7800 depending on complications. Higher weights mean higher Medicare reimbursement.
Can D38.1 be reported with D48.7?
Not as a rule. The Excludes1 note at D38, which applies to D38.1, lists "neoplasm of uncertain behavior of heart (D48.7)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
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.
