T75.21XA — Pneumatic hammer syndrome, initial encounter
T75.21XA is a billable, specific ICD-10-CM code for pneumatic hammer syndrome, 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 T75
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Excludes1 inherited from the categories above T75.21XA
These are not written on T75.21XA, but they bind it: a note on a category applies to every code beneath it. Billing T75.21XA with anything listed here is a denial.
Excludes2 inherited from the categories above T75.21XA
Also inherited, and the opposite of Excludes1: these conditions are not part of T75.21XA, but a patient can have both, so you may code both.
Risk adjustment
T75.21XA 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
T75.21XA is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56612Billing and Coding: CT of the Head
Code history
T75.21XA has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share T75.21. If T75.21XA is not quite right, the correct code is usually one of these.
Questions about T75.21XA
- Is T75.21XA a billable ICD-10-CM code?
- Yes. T75.21XA is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T75.21XA sit in the tabular list?
- Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Other and unspecified effects of external causes (T66-T78).
- What cannot be coded together with T75.21XA?
- T75.21XA carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above T75.21XA (T75) and apply to it just the same.