Alphabetic Index FY2027

C30.0

Malignant neoplasm of nasal cavity

FY2027Chapter 2: Neoplasms/C30–C39 Malignant neoplasms of respiratory and intrathoracic organs

BillableComplete code, valid to report
Care settingsHome Health Primary · MMTA - Infectious Disease, Neoplasms, and Blood-Forming DiseasesIPF Comorbidity · Oncology Treatment

C30.0 (also written C300) is a billable ICD-10-CM diagnosis code for malignant neoplasm of nasal cavity. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 2 codes in category C30 (Malignant neoplasm of nasal cavity and middle ear). The Alphabetic Index lists it under 8 entries. Its coding notes include 8 Excludes1 entries.

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

A primary malignancy code stays in use until treatment directed at that site is completed. After that, with no evidence of disease at the site, Z85 gives the former site.

Guidelines I.C.2.mCurrent malignancy versus personal history of malignancyRead the official text

Excludes1

Not coded here. The listed conditions generally should not be reported together.

This code
  • malignant neoplasm of nasal bone (C41.0)
  • malignant neoplasm of nose NOS (C76.0)
  • malignant neoplasm of olfactory bulb (C72.2-)
  • malignant neoplasm of posterior margin of nasal septum and choana (C11.3)
  • malignant melanoma of skin of nose (C43.31)
  • malignant neoplasm of turbinates (C41.0)
  • other and unspecified malignant neoplasm of skin of nose (C44.301, C44.311, C44.321, C44.391)
Also from chapter/block level (1 note)
Inherited from C30–C39 Malignant neoplasms of respiratory and intrathoracic organs

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Home Health Primary

Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases clinical group.

Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026

IPF Comorbidity

On the CMS IPF comorbidity list.

Comorbidity categoryFactor
Oncology Treatment1.44
It counts as a comorbidity when reported as a secondary diagnosis and actively treated during the stay. An IPF receives only one adjustment within a category and can receive adjustments in more than one category.

Source: CMS IPF PPS FY 2027 final rule (CMS-1847-F), Addendum B-3 (comorbidity codes with adjustment factor); effective for discharges on or after October 1, 2026

Includes

Further defines or gives examples of the content of the category.

Also from chapter/block level (1 note)
Inherited from C30–C39 Malignant neoplasms of respiratory and intrathoracic organs
  • malignant neoplasm of middle ear

Inclusion terms

Conditions classified to this code.

This code
  • Malignant neoplasm of cartilage of nose
  • Malignant neoplasm of nasal concha
  • Malignant neoplasm of internal nose
  • Malignant neoplasm of septum of nose
  • Malignant neoplasm of vestibule of nose

Notes

Also from chapter/block level (8 notes)
Inherited from Chapter 2 Neoplasms
  • 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).

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 8 entries