S40.821D (Blister (nonthermal) of right upper arm, subsequent encounter) compared with S40.829D (Blister (nonthermal) of unspecified upper arm, subsequent encounter), from the official CMS tabular data. S40.821D and S40.829D code the same condition on opposite sides.
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. S40.821D and S40.829D name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| S40.821DBlister (nonthermal) of right upper arm, subsequent encounter | S40.829DBlister (nonthermal) of unspecified upper arm, subsequent encounter | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | S00-T88 — Injury, poisoning and certain other consequences of external causes | S00-T88 — Injury, poisoning and certain other consequences of external causes |
| Definition | Blister (nonthermal) of right upper arm, subsequent encounter is a billable ICD-10-CM diagnosis code (S40.821D). | Blister (nonthermal) of unspecified upper arm, subsequent encounter is a billable ICD-10-CM diagnosis code (S40.829D). |
| 7th character | The appropriate 7th character is to be added to each code from category S40 | The appropriate 7th character is to be added to each code from category S40 |
| Includes | injuries of axilla injuries of scapular region | injuries of axilla injuries of scapular region |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources