2026 ICD-10-CM Diagnosis Code S61.300SUnspecified open wound of right index finger with damage to nail, sequela
S61.300S is a billable ICD-10-CM diagnosis code for unspecified open wound of right index finger with damage to nail, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. 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. The code is exempt from POA reporting. Coders also document this condition as avulsion injury of fingernail. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S61.300S 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.
- Avulsion injury of fingernail
- Avulsion of fingernail of right hand
- Right index finger nail avulsion
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.
Patient EducationClinical
Nail Diseases
Your toenails and fingernails protect the tissues of your toes and fingers. They are made up of layers of a hardened protein called keratin, which is also in your hair and skin. The health of your nails can be a clue to your overall health. Healthy nails are usually smooth and consistent in color.
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Convert S61.300S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S61.300SOverview
Is S61.300S a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified open wound of right index finger with damage to nail, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in S61.300S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the unspecified open wound of right index finger with damage to nail itself has resolved, not the original event.
What MS-DRG does S61.300S group to?
When unspecified open wound of right index finger with damage to nail, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, with relative weights from 0.9160 to 1.4721 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S61.300S 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 of right index finger with damage to nail, sequela on inpatient claims.
What is the ICD-9 equivalent of S61.300S?
Under the General Equivalence Mappings, unspecified open wound of right index finger with damage to nail, sequela converts to ICD-9-CM 906.1 (late eff open wnd extrem). 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.
