T30.4 — Corrosion of unspecified body region, unspecified degree
T30.4 is a billable, specific ICD-10-CM code for corrosion of unspecified body region, unspecified degree. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- This code is not for inpatient use. Code to specified site and degree of corrosion
- Corrosion NOS
- Multiple corrosion NOS
Risk adjustment
T30.4 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
T30.4 is named in 7 Medicare coverage policies — 5 listing it as supporting medical necessity, and 2 listing it as NOT covered. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56566Billing and Coding: Outpatient Physical and Occupational Therapy Servicesnot covered
- A57067Billing and Coding: Outpatient Physical and Occupational Therapy Servicesnot covered
- A52438Billing and Coding: Tetanus Immunization
- A57205Billing and Coding: Oximetry Services
How T30.4 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 T30.4.
- Corrosion(injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Related codes at this level
Codes that share T30. If T30.4 is not quite right, the correct code is usually one of these.
Questions about T30.4
- Is T30.4 a billable ICD-10-CM code?
- Yes. T30.4 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T30.4 sit in the tabular list?
- Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Burns and corrosions of multiple and unspecified body regions (T30-T32).