2026 ICD-10-CM Diagnosis Code S35.405AUnspecified injury of left renal vein, initial encounter

ICD-10-CM Codes›S00–T88›S30-S39›S35

ICD-10-CM S35.405A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S35.405A is a billable ICD-10-CM diagnosis code for unspecified injury of left renal vein, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 913 through 914, 963 through 965. Coders also document this condition as injury of left renal vein. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury to blood vessels, initial encounter.

Code Identity

ICD-10-CM Code
S35.405A
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified injury of left renal vein, initial encounter
Short Description
Unspecified injury of left renal vein, initial encounter
Same as the full description in the CMS dataset.
Parent Code
S35.405
Unspecified injury of left renal vein

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS30-S39Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals
CategoryS35Injury of blood vessels at abdomen, lower back and pelvis level
This CodeS35.405AUnspecified injury of left renal vein, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Injury of left renal vein
  • Injury of renal vein

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Injury of blood vessels at abdomen, lower back and pelvis level (S35). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ016
Injury to blood vessels, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Wounds and Injuries

An injury is damage to your body. It is a general term that refers to harm caused by accidents, falls, hits, weapons, and more. In the U.S., millions of people injure themselves every year. These injuries range from minor to life-threatening.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert S35.405A to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
902.42 Injury renal vein
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S35.405AOverview

Is S35.405A (Unspecified injury of left renal vein) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified injury of left renal vein, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in S35.405A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for unspecified injury of left renal vein, such as an emergency visit or first evaluation.

What MS-DRG does S35.405A group to?

When unspecified injury of left renal vein, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 913, 914, 963, 964, 965, with relative weights from 0.8855 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S35.405A?

Under the General Equivalence Mappings, unspecified injury of left renal vein, initial encounter converts to ICD-9-CM 902.42 (injury renal vein). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.