T84.051A (Periprosthetic osteolysis of internal prosthetic left hip joint, initial encounter) compared with T84.051S (Periprosthetic osteolysis of internal prosthetic left hip joint, sequela), from the official CMS tabular data. T84.051A and T84.051S 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. T84.051A and T84.051S 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.
| T84.051APeriprosthetic osteolysis of internal prosthetic left hip joint, initial encounter | T84.051SPeriprosthetic osteolysis of internal prosthetic left hip joint, 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 | Periprosthetic osteolysis of internal prosthetic left hip joint, initial encounter is a billable ICD-10-CM diagnosis code (T84.051A). | Periprosthetic osteolysis of internal prosthetic left hip joint, sequela is a billable ICD-10-CM diagnosis code (T84.051S). |
| 7th character | The appropriate 7th character is to be added to each code from category T84 | The appropriate 7th character is to be added to each code from category T84 |
| Use additional code | code to identify major osseous defect, if applicable (M89.7-) code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5) code(s) to identify the specified condition resulting from the complication | code to identify major osseous defect, if applicable (M89.7-) code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5) code(s) to identify the specified condition resulting from the complication |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources