2026 ICD-10-CM Diagnosis Code S86.021SLaceration of right Achilles tendon, sequela
S86.021S is a billable ICD-10-CM diagnosis code for laceration of right 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 604 through 605. The code is exempt from POA reporting. Coders also document this condition as injury of right Achilles tendon. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S86.021S 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.
- Injury of right Achilles tendon
- Laceration of Achilles tendon
- Laceration of calf
- Laceration of right Achilles tendon
- Laceration of right lower leg
- Laceration of tendon of lower leg
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:
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Convert S86.021S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S86.021SOverview
Is S86.021S (Laceration of right Achilles tendon) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report laceration of right Achilles tendon, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in S86.021S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the laceration of right Achilles tendon itself has resolved, not the original event.
What MS-DRG does S86.021S group to?
When laceration of right Achilles tendon, 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 S86.021S 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 laceration of right Achilles tendon, sequela on inpatient claims.
What is the ICD-9 equivalent of S86.021S?
Under the General Equivalence Mappings, laceration of right Achilles tendon, 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.
