T23.649 — Corrosion of second degree of unspecified multiple fingers (nail), including thumb
T23.649 is a non-billable header ICD-10-CM code for corrosion of second degree of unspecified multiple fingers (nail), including thumb. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.
This code requires a 7th character
The appropriate 7th character is to be added to each code from category T23
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Risk adjustment
T23.649 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.
How T23.649 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to T23.649.
- Corrosion›thumb›multiple sites with fingers›second degree
- Corrosion›finger›multiple sites›with thumb›second degree
Code to one of these instead T23.649
3 child codes. Green means billable.
- T23.649ACorrosion of second degree of unspecified multiple fingers (nail), including thumb, initial encounter
- T23.649DCorrosion of second degree of unspecified multiple fingers (nail), including thumb, subsequent encounter
- T23.649SCorrosion of second degree of unspecified multiple fingers (nail), including thumb, sequela
Related codes at this level
Codes that share T23.64. If T23.649 is not quite right, the correct code is usually one of these.
Questions about T23.649
- Is T23.649 a billable ICD-10-CM code?
- No. T23.649 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does T23.649 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).