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  6. 2026 ICD-10-CM Code D49

2026 ICD-10-CM Diagnosis Code D49

Neoplasms of unspecified behavior

ICD-10-CM Code:
D49
ICD-10 Code for:
Neoplasms of unspecified behavior
Is Billable?
Not Valid for Submission
Code Navigator:

D49 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity from the list below for a diagnosis of neoplasms of unspecified behavior. The code is not specific and is NOT valid for the year 2026 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Unspecified diagnosis codes like D49 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Specific Coding Applicable to Neoplasms of unspecified behavior

Non-specific codes like D49 require more digits to indicate the appropriate level of specificity. Consider using any of the following billable codes with a higher level of specificity when coding for neoplasms of unspecified behavior:

  • Use D49.0 for Neoplasm of unspecified behavior of digestive system

  • Use D49.1 for Neoplasm of unspecified behavior of respiratory system

  • Use D49.2 for Neoplasm of unspecified behavior of bone, soft tissue, and skin

  • Use D49.3 for Neoplasm of unspecified behavior of breast

  • Use D49.4 for Neoplasm of unspecified behavior of bladder

  • D49.5 for Neoplasm of unspecified behavior of other genitourinary organs

  • D49.51 for Neoplasm of unspecified behavior of kidney

  • Use D49.59 for Neoplasm of unspecified behavior of other genitourinary organ

  • Use D49.6 for Neoplasm of unspecified behavior of brain

  • Use D49.7 for Neoplasm of unspecified behavior of endocrine glands and other parts of nervous system

  • D49.8 for Neoplasm of unspecified behavior of other specified sites

  • Use D49.81 for Neoplasm of unspecified behavior of retina and choroid

  • Use D49.89 for Neoplasm of unspecified behavior of other specified sites

  • Use D49.9 for Neoplasm of unspecified behavior of unspecified site

Code Classification

  • Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
    D50–D89
    • Neoplasms of unspecified behavior
      D49
      • Neoplasms of unspecified behavior
        D49

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Includes

Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
  • 'growth' NOS
  • neoplasm NOS
  • new growth NOS
  • tumor NOS

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • neoplasms of uncertain behavior D37 D44 D48

  • 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.

Code History

  • FY 2026 - No Change, effective from 10/1/2025 through 9/30/2026
  • FY 2025 - No Change, effective from 10/1/2024 through 9/30/2025
  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.