2026 ICD-10-CM Diagnosis Code S64.495AInjury of digital nerve of left ring finger, initial encounter

ICD-10-CM Codes›S00–T88›S60-S69›S64

ICD-10-CM S64.495A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S64.495A is a billable ICD-10-CM diagnosis code for injury of digital nerve of left ring finger, 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 963 through 965. Coders also document this condition as injury of digital nerve of finger of left hand. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury to nerves, muscles and tendons, initial encounter.

Code Identity

ICD-10-CM Code
S64.495A
Billable Status
Yes — Valid for Submission
Code Describes
Injury of digital nerve of left ring finger, initial encounter
Short Description
Injury of digital nerve of left ring finger, init encntr
Parent Code
S64.495
Injury of digital nerve of left ring finger

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS60-S69Injuries to the wrist, hand and fingers
CategoryS64Injury of nerves at wrist and hand level
This CodeS64.495AInjury of digital nerve of left ring finger, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Injury of digital nerve of finger of left hand
  • Traumatic injury of digital nerve of left ring finger

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Injury of nerves at wrist and hand level (S64). 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 INJ025
Injury to nerves, muscles and tendons, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Finger Injuries and Disorders

You use your fingers and thumbs to do everything from grasping objects to playing musical instruments to typing. When there is something wrong with them, it can make life difficult. Common problems include:

Read the full article at MedlinePlus

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

Convert S64.495A to ICD-9-CMHistory

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

ICD-9-CM
955.6 Injury digital nerve
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 S64.495AOverview

Is S64.495A (Injury of digital nerve of left ring finger) a billable code?

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

What does the 7th character A in S64.495A mean?

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

What MS-DRG does S64.495A group to?

When injury of digital nerve of left ring finger, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 963, 964, 965, with relative weights from 0.9405 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S64.495A?

Under the General Equivalence Mappings, injury of digital nerve of left ring finger, initial encounter converts to ICD-9-CM 955.6 (injury digital nerve). 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.