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ICD-10-PCS 2027 procedure code

0HTT0ZZResection of Right Breast, Open Approach

✓ Valid for 2027O.R. procedure

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

About 0HTT0ZZ

0HTT0ZZ is the ICD-10-PCS code for a resection procedure on the right breast using an open approach. In ICD-10-PCS, resection means cutting out or off, without replacement, all of a body part.

In plain terms, this corresponds to unilateral simple mastectomy, the ICD-9-CM procedure title it maps to (85.41).

For a different body part, codes include 0HTU0ZZ (left breast), 0HTV0ZZ (bilateral breast) and 0HTY0ZZ (supernumerary breast).

It is an operating-room procedure in the MS-DRG logic for DRG 582 (Mastectomy for Malignancy with CC/MCC), DRG 583 (Mastectomy for Malignancy without CC/MCC), DRG 584 (Breast Biopsy, Local Excision and Other Breast Procedures with CC/MCC), DRG 585 (Breast Biopsy, Local Excision and Other Breast Procedures without CC/MCC), DRG 907 (Other O.R. Procedures for Injuries with MCC) and DRG 908 (Other O.R. Procedures for Injuries with CC), under the surgical categories “Mastectomy for Malignancy”, “Breast Biopsy, Local Excision and Other Breast Procedures”, “Other O.R. Procedures for Injuries” and 1 more.

It has been valid since ICD-10-PCS took effect on October 1, 2015.

What each character means

1. Section
0Medical and Surgical
2. Body System
HSkin and Breast
3. Operation
TResection

Cutting out or off, without replacement, all of a body part

Includes: Total nephrectomy, total lobectomy of lung

4. Body Part
TBreast, Right
5. Approach
0Open

Cutting through the skin or mucous membrane and any other body layers necessary to expose the site of the procedure

6. Device
ZNo Device
7. Qualifier
ZNo Qualifier

Other versions of this procedure

MS-DRG v44.0 grouping

All DRGs →

Surgical MS-DRGs this procedure can group to, depending on the principal diagnosis's MDC.

MDC 09 · Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast · Mastectomy for Malignancy

MDC 09 · Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast · Breast Biopsy, Local Excision and Other Breast Procedures

ICD-9-CM equivalent

Converter →
  • 85.41Unilateral simple mastectomyapproximate

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 0HTT0ZZ

Is 0HTT0ZZ a valid ICD-10-PCS code for 2027?

Yes. 0HTT0ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0HTT0ZZ an O.R. procedure?

Yes. 0HTT0ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 0HTT0ZZ group to?

Depending on the principal diagnosis, 0HTT0ZZ can group to MS-DRG 582, MS-DRG 583, MS-DRG 584, MS-DRG 585, MS-DRG 907 and MS-DRG 908.

What is the ICD-9 procedure code for 0HTT0ZZ?

The CMS GEMs map 0HTT0ZZ to ICD-9-CM 85.41 (Unilateral simple mastectomy).