2027 ICD-10-CM Diagnosis Code S34.105AUnspecified injury to L5 level of lumbar spinal cord, initial encounter
ICD-10-CM Codes›S00–T88›S30-S39›S34
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Risk Adjusts — HCC 182
- 7th Character A — Initial Encounter
- Not Chronic
S34.105A is a billable ICD-10-CM diagnosis code for unspecified injury to L5 level of lumbar spinal cord, 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 52 through 53, 963 through 965. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 377 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Spinal cord injury (SCI), initial encounter.
For Medicare Advantage risk adjustment, S34.105A maps to CMS-HCC Category 182 (Spinal Cord Disorders/Injuries) under the V28 model, adding a risk factor of about 0.478 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
S34.105A maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
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.
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Injury of lumbar and sacral spinal cord and nerves at abdomen, lower back and pelvis level (S34). 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 S34.105A: its own notes plus those printed at S34, block S30-S39, 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.
- injuries to the abdominal wall
- injuries to the anus
- injuries to the buttock
- injuries to the external genitalia
- injuries to the flank
- injuries to the groin
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.
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- 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.
Notes
General instructions on how these codes are used.
- 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.
- The appropriate 7th character is to be added to each code from category S34
- Ainitial encounter this code
- Dsubsequent encounter
- Ssequela
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name S34.105A, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming S34.105A: they are not reported together with it, unless the two conditions are unrelated.
Code First 2
These codes say to code first a condition named in the note, and S34.105A is one of the conditions named.
Use Additional Code 1
These codes say to use an additional code from the note, and S34.105A is one of the codes named.
Code Also 2
These codes say S34.105A may also be needed to fully describe the condition. The note gives no sequencing direction.
Notes 1
These notes mention S34.105A.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 S34.105A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S34.105AOverview
Is S34.105A (Unspecified injury to L5 level of lumbar spinal cord) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified injury to L5 level of lumbar spinal cord, initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What does the 7th character A in S34.105A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for unspecified injury to L5 level of lumbar spinal cord, such as an emergency visit or first evaluation.
What MS-DRG does S34.105A group to?
When unspecified injury to L5 level of lumbar spinal cord, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 964, 965, 53, 963, 52, with relative weights from 0.9723 to 2.6361 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S34.105A a CC or MCC?
CMS lists S34.105A as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 377 closely related codes in its exclusion list.
What is the ICD-9 equivalent of S34.105A?
Under the General Equivalence Mappings, unspecified injury to L5 level of lumbar spinal cord, initial encounter converts to ICD-9-CM 952.2 (lumbar spinal cord injur). The mapping is approximate, so confirm the match fits the documentation.
What HCC is S34.105A?
S34.105A (unspecified injury to L5 level of lumbar spinal cord, initial encounter) maps to CMS-HCC Category 182 (Spinal Cord Disorders/Injuries), commonly written as HCC 182, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 72 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. It does not map to any RxHCC in the Part D prescription drug model.
Does S34.105A risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, S34.105A adds a risk adjustment factor of about 0.478 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.270 to 0.478 depending on the payment segment). A more severe related category (HCC 180, HCC 181, HCC 191, and HCC 192) supersedes it when both are reported. See the full factor table on the HCC 182 category page.
