2026 ICD-10-CM Diagnosis Code S86.099SOther specified injury of unspecified Achilles tendon, sequela
S86.099S is a billable ICD-10-CM diagnosis code for other specified injury of unspecified Achilles tendon, 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 913 through 914. The code is exempt from POA reporting. Coders also document this condition as complete division, flexor tendon, foot. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S86.099S 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.
- Complete division, flexor tendon, foot
- Complete division, tendo calcaneus
- Traumatic division of tendo Achilles
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Injury of muscle, fascia and tendon at lower leg level (S86). 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
Heel Injuries and Disorders
Heel problems are common and can be painful. Often, they result from too much stress on your heel bone and the tissues that surround it. That stress can come from:
Read the full article at MedlinePlus
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Convert S86.099S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S86.099SOverview
Is S86.099S (Other specified injury of unspecified Achilles tendon) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified injury of unspecified Achilles tendon, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in S86.099S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the other specified injury of unspecified Achilles tendon itself has resolved, not the original event.
What MS-DRG does S86.099S group to?
When other specified injury of unspecified Achilles tendon, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 913, 914, with relative weights from 0.8855 to 1.6346 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S86.099S 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 other specified injury of unspecified Achilles tendon, sequela on inpatient claims.
What is the ICD-9 equivalent of S86.099S?
Under the General Equivalence Mappings, other specified injury of unspecified Achilles tendon, sequela converts to ICD-9-CM 908.9 (late effect injury NOS). 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.
