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S13.180A

S13.180ASubluxation of C7/T1 cervical vertebrae, initial encounter

Billable / specific codeICD-10-CM

S13.180A is a billable, specific ICD-10-CM code for subluxation of c7/t1 cervical vertebrae, initial encounter. It is valid for submission on a claim.

7th character "A" — initial encounter

The appropriate 7th character is to be added to each code from category S13

A
initial encounter
D
subsequent encounter
S
sequela

Risk adjustment

S13.180A does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

S13.180A is named in 11 Medicare coverage policies 11 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

  • A53058Billing and Coding: Home Health Physical Therapy
  • A53065Billing and Coding: Outpatient Physical Therapy
  • A57204Billing and Coding: MRI and CT Scans of the Head and Neck
  • A57311Billing and Coding: Physical Therapy - Home Health

Related codes at this level

Codes that share S13.180. If S13.180A is not quite right, the correct code is usually one of these.

Questions about S13.180A

Is S13.180A a billable ICD-10-CM code?
Yes. S13.180A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does S13.180A sit in the tabular list?
Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the neck (S10-S19).
ICD-10-CMFY2026-Apr· effective April 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release — see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.