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ICD-10-CM 2027 diagnosis code

C41.4Malignant neoplasm of pelvic bones, sacrum and coccyx

✓ Billable / specificCC — complication/comorbidity

C41.4 is a valid, billable ICD-10-CM code for malignant neoplasm of pelvic bones, sacrum and coccyx. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About C41.4

C41.4 is the ICD-10-CM diagnosis code for malignant neoplasm of pelvic bones, sacrum and coccyx. It belongs to category C41 (malignant neoplasm of bone and articular cartilage of other and unspecified sites), block C40-C41 (malignant neoplasms of bone and articular cartilage) and chapter 2 (neoplasms). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within C41 (malignant neoplasm of bone and articular cartilage of other and unspecified sites), C41.4 is specifically for malignant neoplasm of pelvic bones, sacrum and coccyx. Related codes cover bones of skull and face (C41.0), mandible (C41.1), vertebral column (C41.2), ribs, sternum and clavicle (C41.3) and bone and articular cartilage, unspecified (C41.9).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 542 (Pathological Fractures and Musculoskeletal and Connective Tissue Malignancy with MCC, relative weight 1.7211), DRG 543 (Pathological Fractures and Musculoskeletal and Connective Tissue Malignancy with CC, relative weight 1.006) and DRG 544 (Pathological Fractures and Musculoskeletal and Connective Tissue Malignancy without CC/MCC, relative weight 0.7406), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 170.6 (malignant neoplasm of pelvic bones, sacrum, and coccyx).

Notes that apply from higher levels

Instructions written at a parent level also apply to C41.4.

› From C41 Malignant neoplasm of bone and articular cartilage of other and unspecified sites
Excludes1
  • malignant neoplasm of bones of limbs (C40.-)
  • malignant neoplasm of cartilage of ear (C49.0)
  • malignant neoplasm of cartilage of eyelid (C49.0)
  • malignant neoplasm of cartilage of larynx (C32.3)
  • malignant neoplasm of cartilage of limbs (C40.-)
  • malignant neoplasm of cartilage of nose (C30.0)

Broader instructions also apply from C40-C41 Malignant neoplasms of bone and articular cartilage and Chapter 2: Neoplasms.

Table of Drugs & Neoplasms entries

Codes whose notes reference C41.4

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 170.6Malignant neoplasm of pelvic bones, sacrum, and coccyxexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about C41.4

Is C41.4 billable?

Yes. C41.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can C41.4 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict C41.4 as a principal diagnosis.

Is C41.4 a CC or MCC?

C41.4 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does C41.4 group to?

C41.4 is used in the MS-DRG v44.0 logic for MS-DRG 542 (Pathological Fractures and Musculoskeletal and Connective Tissue Malignancy with MCC), MS-DRG 543 (Pathological Fractures and Musculoskeletal and Connective Tissue Malignancy with CC) and MS-DRG 544 (Pathological Fractures and Musculoskeletal and Connective Tissue Malignancy without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for C41.4?

The CMS General Equivalence Mappings map C41.4 to ICD-9-CM 170.6.