2026 ICD-10-CM Diagnosis Code S65.409SUnspecified injury of blood vessel of unspecified thumb, sequela
S65.409S is a billable ICD-10-CM diagnosis code for unspecified injury of blood vessel of unspecified thumb, 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 299 through 301. The code is exempt from POA reporting. Coders also document this condition as injury of blood vessel of thumb. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S65.409S 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 blood vessel of thumb
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Injury of blood vessels at wrist and hand level (S65). 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
Finger Injuries and Disorders
You use your fingers and thumbs to do everything from grasping objects to playing musical instruments to typing. When there is something wrong with them, it can make life difficult. Common problems include:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert S65.409S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S65.409SOverview
Is S65.409S (Unspecified injury of blood vessel of unspecified thumb) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified injury of blood vessel of unspecified thumb, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in S65.409S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the unspecified injury of blood vessel of unspecified thumb itself has resolved, not the original event.
What MS-DRG does S65.409S group to?
When unspecified injury of blood vessel of unspecified thumb, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 299, 300, 301, with relative weights from 0.7197 to 1.6327 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S65.409S 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 injury of blood vessel of unspecified thumb, sequela on inpatient claims.
What is the ICD-9 equivalent of S65.409S?
Under the General Equivalence Mappings, unspecified injury of blood vessel of unspecified thumb, sequela converts to ICD-9-CM 908.3 (late eff inj periph vess). 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.
