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Inpatient Procedure Code

4A1605Z ICD-10-PCS Code: Monitoring of Lymphatic Flow, Open Approach

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
Section4

Measurement and Monitoring

2
Body SystemA

Physiological Systems

3
Root Operation1

Monitoring

Determining the level of a physiological or physical function repetitively over a period of time

4
Body System6

Lymphatic

5
Approach0

Open

6
Function / Device5

Flow

7
QualifierZ

No Qualifier

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 6 MS-DRGs:

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

Related Codes

Same operation — other Approach

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

4A1635Z — Monitoring of Lymphatic Flow, Percutaneous Approach, 4A1675Z — Monitoring of Lymphatic Flow, Via Natural or Artificial Opening, 4A1685Z — Monitoring of Lymphatic Flow, Via Natural or Artificial Opening Endoscopic

Same operation — other Function / Device

Same table and root operation, differing only in the function / device character.

4A160BZ — Monitoring of Lymphatic Pressure, Open Approach

Same operation — other Qualifier

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

4A1605H — Monitoring of Lymphatic Flow using Indocyanine Green Dye, Open Approach

Same procedure category (CCSR), other tables

AHRQ's Clinical Classifications Software Refined groups these ICD-10-PCS procedures with this one under Measurement and monitoring, NEC (Measurement and Monitoring); 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.

4A0D8DZ — Measurement of Urinary Resistance, Via Natural or Artificial Opening Endoscopic, 4A0D8LZ — Measurement of Urinary Volume, Via Natural or Artificial Opening Endoscopic, 4A0F33Z — Measurement of Musculoskeletal Contractility, Percutaneous Approach, 4A0F3BE — Measurement of Musculoskeletal Pressure, Compartment, Percutaneous Approach, 4A0FX3Z — Measurement of Musculoskeletal Contractility, External Approach, 4A0Z76Z — Measurement of Metabolism, Via Natural or Artificial Opening, 4A0Z7KZ — Measurement of Temperature, Via Natural or Artificial Opening, 4A0ZX6Z — Measurement of Metabolism, External Approach, 4A0ZXKZ — Measurement of Temperature, External Approach, 4A0ZXQZ — Measurement of Sleep, External Approach, 4B0FXVZ — Measurement of Musculoskeletal Stimulator, External Approach, XD2G4V7 — Monitoring of Upper GI Oxygen Saturation, Percutaneous Endoscopic Approach, New Technology Group 7, XD2G8V7 — Monitoring of Upper GI Oxygen Saturation, Via Natural or Artificial Opening Endoscopic, New Technology Group 7, XD2H4V7 — Monitoring of Lower GI Oxygen Saturation, Percutaneous Endoscopic Approach, New Technology Group 7, XD2H8V7 — Monitoring of Lower GI Oxygen Saturation, Via Natural or Artificial Opening Endoscopic, New Technology Group 7, XT25XE5 — Monitoring of Kidney using Fluorescent Pyrazine, External Approach, New Technology Group 5, XX2F3W9 — Monitoring of Musculoskeletal Muscle Compartment Pressure, Micro-Electro-Mechanical System, Percutaneous Approach, New Technology Group 9, XX2KXDB — Monitoring of Interstitial Glucose, Wearable Sensor, External Approach, New Technology Group 11, XX2KXP9 — Monitoring of Interstitial Fluid Volume, Sub-Epidermal Moisture using Electrical Biocapacitance, External Approach, New Technology Group 9, XXE5X2A — Measurement of Infection, Phenotypic Fully Automated Rapid Susceptibility Technology with Controlled Inoculum, New Technology Group 10, +45 more

Contextual Map

Every relationship of 4A1605Z 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 4A1605Z with these 5 related codes in Claim Check

PCS table

MS-DRG participation

Clinical classification (CCSR)

MDC crossing · diagnoses (5814)

  • MDC 09 — Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast[MDC crossing]: “Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast — 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 16 — Diseases and Disorders of Blood, Blood Forming Organs and Immunologic Disorders[MDC crossing]: “Diseases and Disorders of Blood, Blood Forming Organs and Immunologic Disorders — 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
  • A06.7 — Cutaneous amebiasis[Same-MDC diagnosis]: “Cutaneous amebiasis — grouped in MDC 09, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
  • A18.4 — Tuberculosis of skin and subcutaneous tissue[Same-MDC diagnosis]: “Tuberculosis of skin and subcutaneous tissue — grouped in MDC 09, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
  • A22.0 — Cutaneous anthrax[Same-MDC diagnosis]: “Cutaneous anthrax — grouped in MDC 09, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
  • A31.1 — Cutaneous mycobacterial infection[Same-MDC diagnosis]: “Cutaneous mycobacterial infection — grouped in MDC 09, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
  • A36.3 — Cutaneous diphtheria[Same-MDC diagnosis]: “Cutaneous diphtheria — grouped in MDC 09, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
  • and 5809 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