2027 ICD-10-CM Diagnosis Code S24.149SBrown-Sequard syndrome at unspecified level of thoracic spinal cord, sequela

ICD-10-CM Codes›S00–T88›S20-S29›S24

ICD-10-CM S24.149S
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

S24.149S is a billable ICD-10-CM diagnosis code for Brown-Sequard syndrome at unspecified level of thoracic spinal cord, 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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 52 through 53. The code is exempt from POA reporting. Coders also document this condition as Brown-Séquard syndrome of thoracic spinal cord. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.

S24.149S no longer risk-adjusts for Medicare Advantage: it mapped to HCC 72 under the retired CMS-HCC V24 model through payment year 2025 but maps to no category in the live V28 model. It still risk-adjusts in the PACE (CMS-HCC V22) category 72, ESRD (V21) category 72, and ESRD (V24) category 72 for payment year 2027.

Code Identity

ICD-10-CM Code
S24.149S
Billable Status
Yes — Valid for Submission
Code Describes
Brown-Sequard syndrome at unspecified level of thoracic spinal cord, sequela
Short Description
Brown-Sequard synd at unsp level of thor spinal cord, sqla
Parent Code
S24.149
Brown-Sequard syndrome at unspecified level of thoracic spinal cord

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS20-S29Injuries to the thorax
CategoryS24Injury of nerves and spinal cord at thorax level
This CodeS24.149SBrown-Sequard syndrome at unspecified level of thoracic spinal cord, sequela

Present on Admission (POA)Billing

S24.149S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Injuries to the thorax (S20-S29).

Medicare Risk Adjustment (HCC)Billing

S24.149S no longer risk-adjusts for Medicare Advantage: it maps to no payment category in the live CMS-HCC V28 model, although it still risk-adjusts in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
Dropped in V28 see all codes that no longer risk-adjust
Prior Model (CMS-HCC V24)
HCC 72
V24 retired last contributed to a Medicare Advantage risk score in payment year 2025
Other CMS Models
PACE (CMS-HCC V22): HCC 72 · ESRD (V21): HCC 72 · ESRD (V24): HCC 72
ESRD V21 weights: 0.102 dialysis, 0.256–0.456 functioning graft · ESRD V24 weights: 0.099 dialysis, 0.222–0.523 functioning graft
Part D (RxHCC)
Not mapped
S24.149S does not risk-adjust in the RxHCC prescription drug model

Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Brown-Séquard syndrome of thoracic spinal cord

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Injury of nerves and spinal cord at thorax level (S24). 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 S24.149S: its own notes plus those printed at S24, block S20-S29, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block S20-S29 Injuries to the thorax applies to 1,602 codes
  • injuries of breast
  • injuries of chest (wall)
  • injuries of interscapular area

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 S24 Injury of nerves and spinal cord at thorax level applies to 93 codes
  • injury of brachial plexus (S14.3)
From Block S20-S29 Injuries to the thorax applies to 1,602 codes
  • burns and corrosions (T20-T32)
  • effects of foreign body in bronchus (T17.5)
  • effects of foreign body in esophagus (T18.1)
  • effects of foreign body in lung (T17.8)
  • effects of foreign body in trachea (T17.4)
  • frostbite (T33-T34)
  • injuries of axilla
  • injuries of clavicle
  • injuries of scapular region
  • injuries of shoulder
  • insect bite or sting, venomous (T63.4)
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 S24 Injury of nerves and spinal cord at thorax level applies to 93 codes
  • any associated:
  • fracture of thoracic vertebra (S22.0-)
  • open wound of thorax (S21.-)
  • transient paralysis (R29.5)

Notes

General instructions on how these codes are used.

From S24 Injury of nerves and spinal cord at thorax level applies to 93 codes
  • Code to highest level of thoracic spinal cord injury
  • Injuries to the spinal cord (S24.0 and S24.1) refer to the cord level and not bone level injury, and can affect nerve roots at and below the level given.
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 S24 Injury of nerves and spinal cord at thorax level applies to 93 codes
  • The appropriate 7th character is to be added to each code from category S24
Values for category S24 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela this code

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

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name S24.149S, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming S24.149S: they are not reported together with it, unless the two conditions are unrelated.

  • G83.8 Other specified paralytic syndromes
    paralytic syndromes due to current spinal cord injury-code to spinal cord injury (S14, S24, S34) names S24, which includes this code

Code First 2

These codes say to code first a condition named in the note, and S24.149S is one of the conditions named.

  • R29.5 Transient paralysis
    any associated spinal cord injury (S14.0, S14.1-, S24.0, S24.1-, S34.0-, S34.1-) names S24.1-, which includes this code
  • S22 Fracture of rib(s), sternum and thoracic spine
    if applicable, spinal cord injury (S24.0-, S24.1-) names S24.1-, which includes this code

Code Also 4

These codes say S24.149S may also be needed to fully describe the condition. The note gives no sequencing direction.

  • S21 Open wound of thorax
    spinal cord injury (S24.0-, S24.1-) names S24.1-, which includes this code
  • S23.1 Subluxation and dislocation of thoracic vertebra
    spinal cord injury (S24.0-, S24.1-) names S24.1-, which includes this code
  • S31 Open wound of abdomen, lower back, pelvis and external genitals
    spinal cord injury (S24.0, S24.1-, S34.0-, S34.1-) names S24.1-, which includes this code
  • S33.1 Subluxation and dislocation of lumbar vertebra
    spinal cord injury (S24.0, S24.1-, S34.0-, S34.1-) names S24.1-, which includes this code

Notes 1

These notes mention S24.149S.

  • S24 Injury of nerves and spinal cord at thorax level
    Injuries to the spinal cord (S24.0 and S24.1) refer to the cord level and not bone level injury, and can affect nerve roots at and below the level given. names S24.1, which includes this code

Clinical ClassificationClinical

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

CCSR INJ073
Injury, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Spinal Cord Injuries

Your spinal cord is a bundle of nerves that runs down the middle of your back. It carries signals back and forth between your body and your brain. A spinal cord injury disrupts the signals. Spinal cord injuries usually begin with a blow that fractures (breaks) or dislocates your vertebrae, the bone disks that make up your spine.

Read the full article at MedlinePlus

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

Convert S24.149S to ICD-9-CMHistory

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

ICD-9-CM
907.2 Late eff spinal cord inj
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 S24.149SOverview

Is S24.149S a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report Brown-Sequard syndrome at unspecified level of thoracic spinal cord, sequela on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character S in S24.149S mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the Brown-Sequard syndrome at unspecified level of thoracic spinal cord itself has resolved, not the original event.

What MS-DRG does S24.149S group to?

When Brown-Sequard syndrome at unspecified level of thoracic spinal cord, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 53, 52, with relative weights from 0.9723 to 1.7843 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S24.149S 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 Brown-Sequard syndrome at unspecified level of thoracic spinal cord, sequela on inpatient claims. The code appears in the Injuries to the thorax (S20-S29) range of the CMS exempt list.

What is the ICD-9 equivalent of S24.149S?

Under the General Equivalence Mappings, Brown-Sequard syndrome at unspecified level of thoracic spinal cord, sequela converts to ICD-9-CM 907.2 (late eff spinal cord inj). The mapping is approximate, so confirm the match fits the documentation.

Does S24.149S risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage. S24.149S mapped to HCC 72 in the retired CMS-HCC V24 model, which last determined payment in 2025, but it maps to no category in the live V28 model; see all codes that no longer risk-adjust. It still risk-adjusts in the PACE (CMS-HCC V22) category 72 (Spinal Cord Disorders/Injuries), ESRD (V21) category 72 (Spinal Cord Disorders/Injuries), and ESRD (V24) category 72 (Spinal Cord Disorders/Injuries).