ICD-10-PCS 2027 procedure code
05N00ZZRelease Azygos Vein, Open Approach
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 05N00ZZ
05N00ZZ is the ICD-10-PCS code for a release procedure on the azygos vein using an open approach. In ICD-10-PCS, release means freeing a body part from an abnormal physical constraint by cutting or by the use of force.
In plain terms, this corresponds to Freeing of vessel, the ICD-9-CM procedure title it maps to (39.91).
For a different body part, codes include 05N10ZZ (hemiazygos vein), 05N30ZZ (right innominate vein), 05N40ZZ (left innominate vein), 05N50ZZ (right subclavian vein), 05N60ZZ (left subclavian vein), 05N70ZZ (right axillary vein) and 19 more.
The same procedure with a different approach is coded 05N03ZZ (percutaneous) and 05N04ZZ (percutaneous endoscopic).
It is an operating-room procedure in the MS-DRG logic for DRG 252 (Other Vascular Procedures with MCC), DRG 253 (Other Vascular Procedures with CC) and DRG 254 (Other Vascular Procedures without CC/MCC), under the surgical category “Other Vascular Procedures”.
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
- 5Upper Veins
- 3. Operation
- NRelease
Freeing a body part from an abnormal physical constraint by cutting or by the use of force
Some of the restraining tissue may be taken out but none of the body part is taken out
Includes: Adhesiolysis, carpal tunnel release
- 4. Body Part
- 0Azygos Vein
Includes: Right ascending lumbar vein; Right subcostal vein
- 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
Different body part
- 05N10ZZHemiazygos Vein
- 05N30ZZInnominate Vein, Right
- 05N40ZZInnominate Vein, Left
- 05N50ZZSubclavian Vein, Right
- 05N60ZZSubclavian Vein, Left
- 05N70ZZAxillary Vein, Right
- 05N80ZZAxillary Vein, Left
- 05N90ZZBrachial Vein, Right
- 05NA0ZZBrachial Vein, Left
- 05NB0ZZBasilic Vein, Right
- 05NC0ZZBasilic Vein, Left
- 05ND0ZZCephalic Vein, Right
Different approach
MS-DRG v44.0 grouping
All DRGs →Surgical MS-DRGs this procedure can group to, depending on the principal diagnosis's MDC.
MDC 05 · Diseases and Disorders of the Circulatory System · Other Vascular Procedures
ICD-9-CM equivalent
Converter →- 39.91Freeing of vesselapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about 05N00ZZ
Is 05N00ZZ a valid ICD-10-PCS code for 2027?
- Yes. 05N00ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
Is 05N00ZZ an O.R. procedure?
- Yes. 05N00ZZ is an O.R. procedure in MS-DRG v44.0.
What DRG does 05N00ZZ group to?
- Depending on the principal diagnosis, 05N00ZZ can group to MS-DRG 252, MS-DRG 253 and MS-DRG 254.
What is the ICD-9 procedure code for 05N00ZZ?
- The CMS GEMs map 05N00ZZ to ICD-9-CM 39.91 (Freeing of vessel).