2027 ICD-10-CM Diagnosis Code S75.991AOther specified injury of unspecified blood vessel at hip and thigh level, right leg, initial encounter

ICD-10-CM Codes›S00–T88›S70-S79›S75

ICD-10-CM S75.991A
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

S75.991A is a billable ICD-10-CM diagnosis code for other specified injury of unspecified blood vessel at hip and thigh level, right leg, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 913 through 914, 963 through 965. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 129 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury to blood vessels, initial encounter.

Code Identity

ICD-10-CM Code
S75.991A
Billable Status
Yes — Valid for Submission
Code Describes
Other specified injury of unspecified blood vessel at hip and thigh level, right leg, initial encounter
Short Description
Inj unsp blood vess at hip and thigh level, right leg, init
Parent Code
S75.991
Other specified injury of unspecified blood vessel at hip and thigh level, right leg

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS70-S79Injuries to the hip and thigh
CategoryS75Injury of blood vessels at hip and thigh level
This CodeS75.991AOther specified injury of unspecified blood vessel at hip and thigh level, right leg, initial encounter

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Injury of blood vessels at hip and thigh level (S75). 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 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to S75.991A: its own notes plus those printed at S75, block S70-S79, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From S75 Injury of blood vessels at hip and thigh level applies to 162 codes
  • injury of blood vessels at lower leg level (S85.-)
  • injury of popliteal artery (S85.0)
From Block S70-S79 Injuries to the hip and thigh applies to 3,546 codes
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From S75 Injury of blood vessels at hip and thigh level applies to 162 codes
  • any associated open wound (S71.-)

Notes

General instructions on how these codes are used.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

From S75 Injury of blood vessels at hip and thigh level applies to 162 codes
  • The appropriate 7th character is to be added to each code from category S75
Values for category S75 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter this code
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ016
Injury to blood vessels, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Leg Injuries and Disorders

Your legs are made up of bones, blood vessels, muscles, and other connective tissue. They are important for motion and standing. Playing sports, running, falling, or having an accident can damage your legs. Common leg injuries include sprains and strains, joint dislocations, and fractures (broken bones).

Read the full article at MedlinePlus

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

Convert S75.991A to ICD-9-CMHistory

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

ICD-9-CM
904.8 Injury leg vessel NOS
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About S75.991AOverview

Is S75.991A a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other specified injury of unspecified blood vessel at hip and thigh level, right leg, initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character A in S75.991A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for other specified injury of unspecified blood vessel at hip and thigh level, right leg, such as an emergency visit or first evaluation.

What MS-DRG does S75.991A group to?

When other specified injury of unspecified blood vessel at hip and thigh level, right leg, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 964, 965, 914, 913, 963, with relative weights from 0.9281 to 2.6361 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S75.991A a CC or MCC?

CMS lists S75.991A as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 129 closely related codes in its exclusion list.

What is the ICD-9 equivalent of S75.991A?

Under the General Equivalence Mappings, other specified injury of unspecified blood vessel at hip and thigh level, right leg, initial encounter converts to ICD-9-CM 904.8 (injury leg vessel NOS). The mapping is approximate, so confirm the match fits the documentation.