T20.43XD — Corrosion of unspecified degree of chin, subsequent encounter
T20.43XD is a billable, specific ICD-10-CM code for corrosion of unspecified degree of chin, subsequent encounter. It is valid for submission on a claim.
7th character "D" — subsequent encounter
The appropriate 7th character is to be added to each code from category T20
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Excludes2 inherited from the categories above T20.43XD
Also inherited, and the opposite of Excludes1: these conditions are not part of T20.43XD, but a patient can have both, so you may code both.
Risk adjustment
T20.43XD 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
T20.43XD 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.
- A59186Billing and Coding: Magnesium
Code history
T20.43XD 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 T20.43. If T20.43XD is not quite right, the correct code is usually one of these.
Questions about T20.43XD
- Is T20.43XD a billable ICD-10-CM code?
- Yes. T20.43XD is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T20.43XD sit in the tabular list?
- Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Burns and corrosions of external body surface, specified by site (T20-T25).