2026 ICD-10-CM Diagnosis Code S61.509AUnspecified open wound of unspecified wrist, initial encounter

ICD-10-CM S61.509A

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

S61.509A is a billable ICD-10-CM diagnosis code for unspecified open wound of unspecified wrist, 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 604 through 605, 963 through 965. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Open wounds to limbs, initial encounter.

Code Identity

ICD-10-CM Code

S61.509A

Billable Status

Yes — Valid for Submission

Code Describes

Unspecified open wound of unspecified wrist, initial encounter

Short Description

Unspecified open wound of unspecified wrist, init encntr

Parent Code

S61.509

Unspecified open wound of unspecified wrist

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes

SectionS60-S69Injuries to the wrist, hand and fingers

CategoryS61Open wound of wrist, hand and fingers

This CodeS61.509AUnspecified open wound of unspecified wrist, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

Filter synonyms:

Fracture dislocation distal radioulnar joint
Fracture dislocation of carpometacarpal joint
Fracture dislocation of lunate
Fracture dislocation of midcarpal joint
Fracture dislocation of radiocarpal joint
Fracture of capitate bone of wrist
Fracture of hamate bone of wrist
Fracture of pisiform bone of wrist
Fracture of sesamoid bone of hand
Fracture of trapezium of wrist
Fracture of trapezoidal bone of wrist
Fracture of triquetral bone of wrist
Fracture subluxation of distal radioulnar joint
Fracture subluxation of lunate
Fracture subluxation of midcarpal joint
Fracture subluxation of perilunate joint
Fracture subluxation of radiocarpal joint
Glass in wrist
Multiple open wounds of hand
Multiple open wounds of wrist
Multiple open wounds of wrist and hand
Open dislocation of wrist
Open division of multiple ligaments of wrist
Open division wrist and/or hand ligament
Open division wrist ligament
Open division wrist ligament, single
Open fracture dislocation carpometacarpal joint
Open fracture dislocation lunate
Open fracture dislocation midcarpal
Open fracture dislocation of distal radioulnar joint
Open fracture dislocation perilunate
Open fracture dislocation perilunate transscaphoid
Open fracture dislocation radiocarpal joint
Open fracture dislocation wrist
Open fracture hamate, hook
Open fracture of bone of wrist and/or hand
Open fracture of capitate bone of wrist
Open fracture of hamate bone of wrist
Open fracture of lunate bone of wrist
Open fracture of multiple carpal bones
Open fracture of pisiform bone of wrist
Open fracture of scaphoid bone
Open fracture of sesamoid bone of hand
Open fracture of trapezium of wrist
Open fracture of trapezoidal bone of wrist
Open fracture of triquetral bone of wrist
Open fracture subluxation lunate
Open fracture subluxation midcarpal
Open fracture subluxation of distal radioulnar joint
Open fracture subluxation of wrist
Open fracture subluxation perilunate
Open fracture subluxation perilunate transscaphoid
Open fracture subluxation radiocarpal joint
Open traumatic dislocation carpometacarpal joint
Open traumatic dislocation distal radioulnar joint
Open traumatic dislocation lunate
Open traumatic dislocation midcarpal joint
Open traumatic dislocation perilunate
Open traumatic dislocation radiocarpal joint
Open traumatic subluxation distal radioulnar joint
Open traumatic subluxation lunate
Open traumatic subluxation midcarpal joint
Open traumatic subluxation of wrist
Open traumatic subluxation perilunate
Open traumatic subluxation radiocarpal joint
Open wound of wrist
Open wound of wrist, dorsal
Open wound of wrist, volar
Pellet wound of wrist
Subluxation of distal radioulnar joint
Subluxation of wrist joint
Transscaphoid-perilunate fracture dislocation
Traumatic dislocation of lunate bone
Traumatic dislocation of midcarpal joint
Traumatic division of wrist ligament

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Open wound of wrist, hand and fingers (S61). 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 INJ012

Open wounds to limbs, 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 S61.509A to ICD-9-CMHistory

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

ICD-9-CM

881.02 Open wound of wrist

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 S61.509AOverview

Is S61.509A (Unspecified open wound of unspecified wrist) a billable code?

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

What does the 7th character A in S61.509A mean?

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

What MS-DRG does S61.509A group to?

When unspecified open wound of unspecified wrist, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, 963, 964, 965, with relative weights from 0.9160 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S61.509A?

Under the General Equivalence Mappings, unspecified open wound of unspecified wrist, initial encounter converts to ICD-9-CM 881.02 (open wound of wrist). 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.

Indicator	Meaning	CMS pays CC/MCC DRG
Y	Diagnosis was present at the time of inpatient admission	Yes
N	Diagnosis was not present at the time of admission	No
U	Documentation is insufficient to determine	No
W	Clinically undetermined	Yes
1	Unreported, exempt from POA reporting	No