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T15.91XA vs T15.91XD

T15.91XA (Foreign body on external eye, part unspecified, right eye, initial encounter) compared with T15.91XD (Foreign body on external eye, part unspecified, right eye, subsequent encounter), from the official CMS tabular data. T15.91XA and T15.91XD code the same injury at a different phase of treatment. MedCoder-derived

Relationship

Review

Encounter relationship

T15.91XA
Initial encounter
Foreign body on external eye, part unspecified, right eye, initial encounter
↔
T15.91XD
Subsequent encounter
Foreign body on external eye, part unspecified, right eye, subsequent encounter

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

Can these codes be reported together?

Same injury, other encounter phase. T15.91XA and T15.91XD 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.

Side by side

T15.91XAForeign body on external eye, part unspecified, right eye, initial encounterT15.91XDForeign body on external eye, part unspecified, right eye, subsequent encounter
Billing statusBillableBillable
ClassificationS00-T88 — Injury, poisoning and certain other consequences of external causesS00-T88 — Injury, poisoning and certain other consequences of external causes
DefinitionForeign body on external eye, part unspecified, right eye, initial encounter is a billable ICD-10-CM diagnosis code (T15.91A).Foreign body on external eye, part unspecified, right eye, subsequent encounter is a billable ICD-10-CM diagnosis code (T15.91D).
7th characterThe appropriate 7th character is to be added to each code from category T15The appropriate 7th character is to be added to each code from category T15
Use additional code
code, if known, for foreign body entering into or through a natural orifice (W44.-)
code, if known, for foreign body entering into or through a natural orifice (W44.-)
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources