2026 ICD-10-CM Diagnosis Code S91.301DUnspecified open wound, right foot, subsequent encounter

ICD-10-CM S91.301D

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

S91.301D is a billable ICD-10-CM diagnosis code for unspecified open wound, right foot, subsequent encounter. The 7th character D marks it as a subsequent encounter code, used during routine care in the healing or recovery phase. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 949 through 950. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Open wounds to limbs, subsequent encounter.

Code Identity

ICD-10-CM Code

S91.301D

Billable Status

Yes — Valid for Submission

Code Describes

Unspecified open wound, right foot, subsequent encounter

Short Description

Unspecified open wound, right foot, subsequent encounter

Same as the full description in the CMS dataset.

Parent Code

S91.301

Unspecified open wound, right foot

Code Classification

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

SectionS90-S99Injuries to the ankle and foot

CategoryS91Open wound of ankle, foot and toes

This CodeS91.301DUnspecified open wound, right foot, subsequent encounter

Present on Admission (POA)Billing

S91.301D is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

Filter synonyms:

Fracture of cuboid
Fracture of fifth metatarsal bone of right foot
Fracture of first metatarsal bone of right foot
Fracture of fourth metatarsal bone of right foot
Fracture of lateral cuneiform
Fracture of medial cuneiform
Fracture of navicular
Fracture of right calcaneum
Fracture of right talus
Fracture of second metatarsal bone of right foot
Fracture of third metatarsal bone of right foot
Open dislocation of right tarsal joint
Open fracture of calcaneus
Open fracture of cuboid bone of foot
Open fracture of cuboid bone of right foot
Open fracture of cuneiform bone of foot
Open fracture of fifth metatarsal bone
Open fracture of fifth metatarsal bone of right foot
Open fracture of first metatarsal bone
Open fracture of first metatarsal bone of right foot
Open fracture of fourth metatarsal bone
Open fracture of fourth metatarsal bone of right foot
Open fracture of lateral cuneiform bone of foot
Open fracture of lateral cuneiform bone of right foot
Open fracture of medial cuneiform bone of foot
Open fracture of medial cuneiform bone of right foot
Open fracture of metaphysis of fifth metatarsal bone
Open fracture of metaphysis of fifth metatarsal bone of right foot
Open fracture of metaphysis of first metatarsal bone
Open fracture of metaphysis of first metatarsal bone of right foot
Open fracture of metaphysis of metatarsal bone
Open fracture of metatarsal bone of right foot
Open fracture of navicular bone of foot
Open fracture of navicular bone of right foot
Open fracture of right ankle
Open fracture of right calcaneus
Open fracture of right foot
Open fracture of right talus
Open fracture of second metatarsal bone
Open fracture of second metatarsal bone of right foot
Open fracture of talus
Open fracture of tarsal bone of right foot
Open fracture of third metatarsal bone
Open fracture of third metatarsal bone of right foot
Open traumatic dislocation of joint of right foot
Open traumatic dislocation of tarsometatarsal joint
Open traumatic dislocation of tarsometatarsal joint of right foot
Open wound of right foot
Traumatic dislocation of tarsometatarsal joint

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Open wound of ankle, foot and toes (S91). 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 INJ049

Open wounds to limbs, subsequent encounter

Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Foot Injuries and Disorders

Each of your feet has 26 bones, 33 joints, and more than 100 tendons, muscles, and ligaments. No wonder a lot of things can go wrong. Here are a few common problems:

Read the full article at MedlinePlus

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

Convert S91.301D to ICD-9-CMHistory

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

ICD-9-CM

V58.89 Other specfied aftercare

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 S91.301DOverview

Is S91.301D (Unspecified open wound, right foot) a billable code?

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

What does the 7th character D in S91.301D mean?

The final character D marks a subsequent encounter: use it for routine care while the unspecified open wound, right foot is healing, after active treatment has ended.

What MS-DRG does S91.301D group to?

When unspecified open wound, right foot, subsequent encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 949, 950, with relative weights from 0.6277 to 1.1897 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S91.301D exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for unspecified open wound, right foot, subsequent encounter on inpatient claims.

What is the ICD-9 equivalent of S91.301D?

Under the General Equivalence Mappings, unspecified open wound, right foot, subsequent encounter converts to ICD-9-CM V58.89 (other specfied aftercare). 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