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Inpatient Procedure Code

00950ZX ICD-10-PCS Code: Drainage of Intracranial Subarachnoid Space, Open Approach, Diagnostic

Drainage of Cran Subrac Spc, Open Approach, Diagn

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Axis Breakdown

Every ICD-10-PCS code is exactly seven characters, one per axis. Each character's meaning is defined by its position in the code.

PositionValueMeaning
1
Section0

Medical and Surgical

2
Body System0

Central Nervous System and Cranial Nerves

3
Root Operation9

Drainage

Taking or letting out fluids and/or gases from a body part

4
Body Part5

Subarachnoid Space, Intracranial

5
Approach0

Open

6
DeviceZ

No Device

7
QualifierX

Diagnostic

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

The MS-DRG grouper treats this as an operating room procedure. It appears in the surgical logic of 11 MS-DRGs:

  • MDC 01 — Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis: DRG 023, DRG 024
  • MDC 01 — Craniotomy and endovascular intracranial procedures: DRG 025, DRG 026, DRG 027
  • MDC 17 — Lymphoma and Leukemia with Major O.R. Procedures: DRG 820, DRG 821, DRG 822
  • MDC 17 — Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures: DRG 826, DRG 827, DRG 828

From the CMS MS-DRG Definitions Manual, Appendix E. Actual DRG assignment depends on the complete claim.

Related Codes

Same operation — other Body Part

Same table and root operation, differing only in the body part character.

00910ZX — Drainage of Cerebral Meninges, Open Approach, Diagnostic, 00920ZX — Drainage of Dura Mater, Open Approach, Diagnostic, 00930ZX — Drainage of Intracranial Epidural Space, Open Approach, Diagnostic, 00940ZX — Drainage of Intracranial Subdural Space, Open Approach, Diagnostic, 00960ZX — Drainage of Cerebral Ventricle, Open Approach, Diagnostic, 00970ZX — Drainage of Cerebral Hemisphere, Open Approach, Diagnostic, 00980ZX — Drainage of Basal Ganglia, Open Approach, Diagnostic, 00990ZX — Drainage of Thalamus, Open Approach, Diagnostic, +22 more

Same operation — other Approach

Same table and root operation, differing only in the approach character.

00953ZX — Drainage of Intracranial Subarachnoid Space, Percutaneous Approach, Diagnostic, 00954ZX — Drainage of Intracranial Subarachnoid Space, Percutaneous Endoscopic Approach, Diagnostic

Same operation — other Qualifier

Same table and root operation, differing only in the qualifier character.

00950ZZ — Drainage of Intracranial Subarachnoid Space, Open Approach

Same procedure category (CCSR), other tables

AHRQ's Clinical Classifications Software Refined groups these ICD-10-PCS procedures with this one under Minimally invasive CNS biopsy (Central Nervous System Procedures); listed here are the members in other PCS tables. Source: Clinical Classifications Software Refined (CCSR), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, November 2025.

00B03ZX — Excision of Brain, Percutaneous Approach, Diagnostic, 00B04ZX — Excision of Brain, Percutaneous Endoscopic Approach, Diagnostic, 00B10ZX — Excision of Cerebral Meninges, Open Approach, Diagnostic, 00B13ZX — Excision of Cerebral Meninges, Percutaneous Approach, Diagnostic, 00B14ZX — Excision of Cerebral Meninges, Percutaneous Endoscopic Approach, Diagnostic, 00B20ZX — Excision of Dura Mater, Open Approach, Diagnostic, 00B23ZX — Excision of Dura Mater, Percutaneous Approach, Diagnostic, 00B24ZX — Excision of Dura Mater, Percutaneous Endoscopic Approach, Diagnostic, 00B63ZX — Excision of Cerebral Ventricle, Percutaneous Approach, Diagnostic, 00B64ZX — Excision of Cerebral Ventricle, Percutaneous Endoscopic Approach, Diagnostic, 00B73ZX — Excision of Cerebral Hemisphere, Percutaneous Approach, Diagnostic, 00B74ZX — Excision of Cerebral Hemisphere, Percutaneous Endoscopic Approach, Diagnostic, 00B83ZX — Excision of Basal Ganglia, Percutaneous Approach, Diagnostic, 00B84ZX — Excision of Basal Ganglia, Percutaneous Endoscopic Approach, Diagnostic, 00B93ZX — Excision of Thalamus, Percutaneous Approach, Diagnostic, 00B94ZX — Excision of Thalamus, Percutaneous Endoscopic Approach, Diagnostic, 00BA3ZX — Excision of Hypothalamus, Percutaneous Approach, Diagnostic, 00BA4ZX — Excision of Hypothalamus, Percutaneous Endoscopic Approach, Diagnostic, 00BB3ZX — Excision of Pons, Percutaneous Approach, Diagnostic, 00BB4ZX — Excision of Pons, Percutaneous Endoscopic Approach, Diagnostic, +78 more

Contextual Map

Every relationship of 00950ZX in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run 00950ZX with these 5 related codes in Claim Check

PCS table

MS-DRG participation (11)

Clinical classification (CCSR)

MDC crossing · diagnoses (3302)

  • MDC 01 — Diseases and Disorders of the Nervous System[MDC crossing]: “Diseases and Disorders of the Nervous System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”— CMS MS-DRG Definitions Manual · FY2027
  • MDC 17 — Myeloproliferative Diseases and Disorders, Poorly Differentiated Neoplasms[MDC crossing]: “Myeloproliferative Diseases and Disorders, Poorly Differentiated Neoplasms — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”— CMS MS-DRG Definitions Manual · FY2027
  • A02.21 — Salmonella meningitis[Same-MDC diagnosis]: “Salmonella meningitis — grouped in MDC 01, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
  • A06.6 — Amebic brain abscess[Same-MDC diagnosis]: “Amebic brain abscess — grouped in MDC 01, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
  • A17.0 — Tuberculous meningitis[Same-MDC diagnosis]: “Tuberculous meningitis — grouped in MDC 01, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
  • A17.1 — Meningeal tuberculoma[Same-MDC diagnosis]: “Meningeal tuberculoma — grouped in MDC 01, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
  • A17.81 — Tuberculoma of brain and spinal cord[Same-MDC diagnosis]: “Tuberculoma of brain and spinal cord — grouped in MDC 01, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
  • and 3297 more

Nearest codes

Change history

Change history

  • FY2018 — October 1, 2017
    Description revised
    Drainage of Subarachnoid Space, Open Approach, Diagnostic → Drainage of Intracranial Subarachnoid Space, Open Approach, Diagnostic
    FY2018 changes

Read from: CMS ICD-10-PCS code tables, index and definitions — FY2027; CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44; AHRQ HCUP Clinical Classifications Software Refined for ICD-10-PCS Procedures (hcup-us.ahrq.gov/toolssoftware/ccsr/PRCCSR_v2026-1.zip) — v2026.1. All data sources · How to read the labels · How MedCoder verifies its implementation

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources