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Inpatient Procedure Code

00990ZX ICD-10-PCS Code: Drainage of Thalamus, Open Approach, Diagnostic

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 Part9

Thalamus

5
Approach0

Open

6
DeviceZ

No Device

7
QualifierX

Diagnostic

MS-DRG Grouper Relationships (FY2026)

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.

00950ZX — Drainage of Intracranial Subarachnoid 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, 009A0ZX — Drainage of Hypothalamus, Open Approach, Diagnostic, 009B0ZX — Drainage of Pons, Open Approach, Diagnostic, 009C0ZX — Drainage of Cerebellum, Open Approach, Diagnostic, 009D0ZX — Drainage of Medulla Oblongata, Open Approach, Diagnostic, +22 more

Same operation — other Approach

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

00993ZX — Drainage of Thalamus, Percutaneous Approach, Diagnostic, 00994ZX — Drainage of Thalamus, Percutaneous Endoscopic Approach, Diagnostic

Same operation — other Qualifier

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

00990ZZ — Drainage of Thalamus, 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 00990ZX 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 00990ZX with these 5 related codes in Claim Check

PCS table

MS-DRG participation (11)

Clinical classification (CCSR)

MDC crossing · diagnoses (3301)

  • 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 · FY2026
  • 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 · FY2026
  • 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) · FY2026
  • 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) · FY2026
  • 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) · FY2026
  • 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) · FY2026
  • 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) · FY2026
  • and 3296 more

Nearest codes

Change history

No changes recorded for this code. This ledger tracks additions, deletions and description changes from FY2026 (April) onward. Note changes are not tracked.

Read from: CMS ICD-10-PCS code tables, index and definitions — FY2026 (April); CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43; 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