S35.318A (Other specified injury of portal vein, initial encounter) compared with S35.318D (Other specified injury of portal vein, subsequent encounter), from the official CMS tabular data. S35.318A and S35.318D code the same injury at a different phase of treatment.
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. S35.318A and S35.318D 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.
| S35.318AOther specified injury of portal vein, initial encounter | S35.318DOther specified injury of portal vein, subsequent 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 | Other specified injury of portal vein, initial encounter is a billable ICD-10-CM diagnosis code (S35.318A). | Other specified injury of portal vein, subsequent encounter is a billable ICD-10-CM diagnosis code (S35.318D). |
| 7th character | The appropriate 7th character is to be added to each code from category S35 | The appropriate 7th character is to be added to each code from category S35 |
| Includes | injuries to the abdominal wall injuries to the anus injuries to the buttock injuries to the external genitalia | injuries to the abdominal wall injuries to the anus injuries to the buttock injuries to the external genitalia |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources