2026 ICD-10-CM Diagnosis Code S13.100DSubluxation of unspecified cervical vertebrae, subsequent encounter
S13.100D is a billable ICD-10-CM diagnosis code for subluxation of unspecified cervical vertebrae, subsequent encounter. The 7th character D marks it as a subsequent encounter code, used during routine care in the healing or recovery phase. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 949 through 950. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Dislocations, subsequent encounter.
Code Identity
Code Classification
Present on Admission (POA)Billing
S13.100D 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.
- Central cord syndrome of cervical cord due to open subluxation of cervical spine
- Central cord syndrome of cervical spinal cord due to closed dislocation of cervical spine
- Central cord syndrome of cervical spinal cord due to closed subluxation of cervical spine
- Central cord syndrome of cervical spinal cord due to open dislocation of cervical spine
- Central cord syndrome of cervical spinal cord due to traumatic injury
- Closed spinal dislocation with anterior cervical cord lesion
- Closed spinal dislocation with complete cervical cord lesion
- Closed spinal subluxation with anterior cervical cord lesion
- Closed spinal subluxation with complete cervical cord lesion
- Closed subluxation cervical spine
- Closed subluxation of multiple cervical vertebrae
- Closed traumatic dislocation of cervical vertebra
- Multiple closed dislocations of back
- Multiple open dislocations of back
- Open dislocation of multiple cervical vertebrae
- Open spinal dislocation with anterior cervical cord lesion
- Open spinal dislocation with complete cervical cord lesion
- Open spinal subluxation with anterior cervical cord lesion
- Open spinal subluxation with complete cervical cord lesion
- Open subluxation cervical spine
- Open subluxation of multiple cervical vertebrae
- Posterior cord syndrome of cervical spinal cord due to open dislocation of cervical spine
- Posterior cord syndrome of cervical spinal cord due to open subluxation of cervical spine
- Posterior cord syndrome of cervical spine due to closed dislocation of cervical spine
- Posterior cord syndrome of cervical spine due to closed subluxation of cervical spine
- Spinal subluxation with cervical cord lesion
- Subluxation of joint of cervical spine
- Traumatic dislocation of multiple cervical vertebra
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Dislocation and sprain of joints and ligaments at neck level (S13). 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
Dislocations
Dislocations are joint injuries that force the ends of your bones out of position. The cause is often a fall or a blow, sometimes from playing a contact sport. You can dislocate your ankles, knees, shoulders, hips, elbows and jaw. You can also dislocate your finger and toe joints.
Read the full article at MedlinePlus
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Convert S13.100D to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S13.100DOverview
Is S13.100D (Subluxation of unspecified cervical vertebrae) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report subluxation of unspecified cervical vertebrae, subsequent encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character D in S13.100D mean?
The final character D marks a subsequent encounter: use it for routine care while the subluxation of unspecified cervical vertebrae is healing, after active treatment has ended.
What MS-DRG does S13.100D group to?
When subluxation of unspecified cervical vertebrae, subsequent encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 949, 950, with relative weights from 0.6277 to 1.1897 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S13.100D 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 subluxation of unspecified cervical vertebrae, subsequent encounter on inpatient claims.
What is the ICD-9 equivalent of S13.100D?
Under the General Equivalence Mappings, subluxation of unspecified cervical vertebrae, subsequent encounter converts to ICD-9-CM V58.89 (other specfied aftercare). 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.
