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FY2027 ICD-10-CM reference

C33: Malignant neoplasm of trachea

By the HCC Buddy Coding Team

The official ICD-10-CM descriptor is Malignant neoplasm of trachea. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.

Billable code. Verified against the official FY2027 order file.

Oct to Dec 2026, PY2027

CMS-HCC V28

Mapped
  • HCC 20Lung and Other Severe CancersCoefficient 1.136 (CNA, PY2027)

CMS-HCC V24

Not used by CMS

ESRD

Mapped
  • HCC 9Lung and Other Severe CancersCoefficient 0.181 (Dialysis CE, PY2027)

RxHCC

Mapped
  • HCC 20Lung, Kidney, and Other Cancers; Secondary Ca...Coefficient 0.678 (MA-PD CE non-low aged, PY2027)

PACE (CMS-HCC V22 component)

Mapped
  • HCC 9Lung and Other Severe Cancers

PACE ESRD (ESRD V21 component)

Mapped
  • HCC 9Lung and Other Severe Cancers

PACE RxHCC (2018/2019 component)

Mapped
  • HCC 20Lung, Kidney, and Other Cancers; Secondary Ca...

Jan to Sep 2027, PY2028

CMS-HCC V28

Not published by CMS

CMS-HCC V24

Not published by CMS

ESRD

Not published by CMS

RxHCC

Not published by CMS

PACE (CMS-HCC V22 component)

Not published by CMS

PACE ESRD (ESRD V21 component)

Not published by CMS

PACE RxHCC component

Not published by CMS

Oct to Dec 2026, BY2026

HHS-HCC

Pending

Jan to Sep 2027, BY2027

HHS-HCC

Not published by CMS

FY2027 Tabular instructions

Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.

Instructional note

Functional activity

Source: C00-D49 (chapter, inherited).

Instructional note

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.

Source: C00-D49 (chapter, inherited).

Instructional note

Morphology [Histology]

Source: C00-D49 (chapter, inherited).

Instructional note

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.

Source: C00-D49 (chapter, inherited).

Instructional note

Primary malignant neoplasms overlapping site boundaries

Source: C00-D49 (chapter, inherited).

Instructional note

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.

Source: C00-D49 (chapter, inherited).

Instructional note

Malignant neoplasm of ectopic tissue

Source: C00-D49 (chapter, inherited).

Instructional note

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: C00-D49 (chapter, inherited).

Includes

malignant neoplasm of middle ear

Source: C30-C39 (section, inherited).

Excludes1

mesothelioma (C45.-)

Source: C30-C39 (section, inherited).

Instructional note

code to identify:

Source: C33 (category, direct).

Instructional note

exposure to environmental tobacco smoke (Z77.22)

Source: C33 (category, direct).

Instructional note

exposure to tobacco smoke in the perinatal period (P96.81)

Source: C33 (category, direct).

Instructional note

history of tobacco dependence (Z87.891)

Source: C33 (category, direct).

Instructional note

occupational exposure to environmental tobacco smoke (Z57.31)

Source: C33 (category, direct).

Instructional note

tobacco dependence (F17.-)

Source: C33 (category, direct).

Instructional note

tobacco use (Z72.0)

Source: C33 (category, direct).

Source: CMS FY2027 Tabular List and Alphabetic Index.

Open Tabular instructions and code details

Compare the FY2027 additions, removals and billable-status changes

What does C33 mean in FY2027?

The official ICD-10-CM descriptor is Malignant neoplasm of trachea. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.

Is C33 billable in FY2027?

The FY2027 order file marks C33 as billable. Check the complete Tabular instructions and documentation before assigning it.

Does C33 map to an HCC?

Oct to Dec 2026, PY2027: CMS-HCC V28 HCC 20 (Lung and Other Severe Cancers); CMS-HCC V24: Not used by CMS; ESRD HCC 9 (Lung and Other Severe Cancers); RxHCC HCC 20 (Lung, Kidney, and Other Cancers; Secondary Cancer of Lymph Nodes and Other Sites). Jan to Sep 2027, PY2028: CMS-HCC V28: Not published by CMS; CMS-HCC V24: Not published by CMS; ESRD: Not published by CMS; RxHCC: Not published by CMS. Oct to Dec 2026, BY2026: HHS-HCC: Pending. Jan to Sep 2027, BY2027: HHS-HCC: Not published by CMS. Base coefficients are reference values, not a member total.

Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.

Review the FY2026 April edition