S00.422A (Blister (nonthermal) of left ear, initial encounter) compared with S00.429A (Blister (nonthermal) of unspecified ear, initial encounter), from the official CMS tabular data. S00.422A and S00.429A code the same condition on opposite sides. MedCoder-derived
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. S00.422A and S00.429A 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.
| S00.422ABlister (nonthermal) of left ear, initial encounter | S00.429ABlister (nonthermal) of unspecified ear, initial encounter | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Blister (nonthermal) of left ear, initial encounter is a billable ICD-10-CM diagnosis code (S00.422A). | Blister (nonthermal) of unspecified ear, initial encounter is a billable ICD-10-CM diagnosis code (S00.429A). |
| 7th character | The appropriate 7th character is to be added to each code from category S00 | The appropriate 7th character is to be added to each code from category S00 |
| Includes | injuries of ear injuries of eye injuries of face [any part] injuries of gum | injuries of ear injuries of eye injuries of face [any part] injuries of gum |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources