S70.361A (Insect bite (nonvenomous), right thigh, initial encounter) compared with S70.361S (Insect bite (nonvenomous), right thigh, sequela), from the official CMS tabular data. S70.361A and S70.361S code the same injury at a different phase of treatment. MedCoder-derived
Same underlying diagnosis, different encounter phase.
The 7th character records the phase of care for the encounter being coded, so a single encounter takes one of these characters, not several. Review whether both phases belong on the same episode of care.
Source: ICD-10-CM Official Guidelines, Section I.C.19.a
Same injury, other encounter phase. S70.361A and S70.361S code the same injury at a different phase of treatment, set by the 7th character.
The 7th character records the type of care given at the encounter being coded (ICD-10-CM Official Guidelines, Section I.C.19.a), so one encounter takes one of these, not both.
| S70.361AInsect bite (nonvenomous), right thigh, initial encounter | S70.361SInsect bite (nonvenomous), right thigh, sequela | |
|---|---|---|
| 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 | Insect bite (nonvenomous), right thigh, initial encounter is a billable ICD-10-CM diagnosis code (S70.361A). | Insect bite (nonvenomous), right thigh, sequela is a billable ICD-10-CM diagnosis code (S70.361S). |
| 7th character | The appropriate 7th character is to be added to each code from category S70 | The appropriate 7th character is to be added to each code from category S70 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources