T88.7XXA — Unspecified adverse effect of drug or medicament, initial encounter
Is T88.7XXA billable?
Yes, but T88.7XXA is an unspecified code. T88.7XXA is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T88.7XXA is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting T88.7XXA.
T88.7XXA at a glance
| Code | T88.7XXA |
|---|---|
| Description | Unspecified adverse effect of drug or medicament, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in T88.7XXA?
In T88.7XXA, the 7th character A means initial encounter. The 7th character is required for T88.7XXA to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T88.7XXA group to?
T88.7XXA sits in MDC 21 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 919Complications of Treatment with MCCmedical
- 920Complications of Treatment with CCmedical
- 921Complications of Treatment without CC/MCCmedical
How is T88.7XXA listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T88.7, the nearest indexed parent of T88.7XXA. Use them to find the family, then select the specific code.
- Complication › chemotherapyNEC (s) (from) (of)
- Complication › drug NEC (s) (from) (of)
- Damage › medication
- Effect, adverse › drugs and medicaments
- Hypersensitive, hypersensitiveness, hypersensitivity › drug
- Reaction › drug NEC
Excludes1 — never code together
The conditions below can never be reported together with T88.7XXA on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code
Report an additional code alongside T88.7XXA to fully describe the condition. T88.7XXA is sequenced first.
- code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
Inclusion terms
Alternative wording in documentation that is classified to T88.7XXA.
- Drug hypersensitivity NOS
- Drug reaction NOS
Excludes1 — never code together — inherited from T88.7
The conditions below can never be reported together with T88.7XXA on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from Chapter 19
Report an additional code alongside T88.7XXA to fully describe the condition. T88.7XXA is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T80-T88
Report an additional code alongside T88.7XXA to fully describe the condition. T88.7XXA is sequenced first.
Use additional code — inherited from T88.7
Report an additional code alongside T88.7XXA to fully describe the condition. T88.7XXA is sequenced first.
- code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T88.7XXA, but a patient may have both at the same time. When documentation supports it, T88.7XXA and the excluded code may both be reported.
Excludes2 — not included here — inherited from T80-T88
The conditions below are not part of T88.7XXA, but a patient may have both at the same time. When documentation supports it, T88.7XXA and the excluded code may both be reported.
- any encounters with medical care for postprocedural conditions in which no complications are present, such as:
- artificial opening status (Z93.-)
- closure of external stoma (Z43.-)
- fitting and adjustment of external prosthetic device (Z44.-)
- burns and corrosions from local applications and irradiation (T20-T32)
- complications of surgical procedures during pregnancy, childbirth and the puerperium (O00-O9A)
- mechanical complication of respirator [ventilator] (J95.850)
- poisoning and toxic effects of drugs and chemicals (T36-T65 with fifth or sixth character 1-4 or 6)
- postprocedural fever (R50.82)
- specified complications classified elsewhere, such as:
- cerebrospinal fluid leak from spinal puncture (G97.0)
- colostomy malfunction (K94.0-)
- disorders of fluid and electrolyte imbalance (E86-E87)
- functional disturbances following cardiac surgery (I97.0-I97.1)
- intraoperative and postprocedural complications of specified body systems (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95.6-, J95.7, K91.6-, L76.-, M96.-, N99.-)
- ostomy complications (J95.0-, K94.-, N99.5-)
- postgastric surgery syndromes (K91.1)
- postlaminectomy syndrome NEC (M96.1)
- postmastectomy lymphedema syndrome (I97.2)
- postsurgical blind-loop syndrome (K91.2)
- ventilator associated pneumonia (J95.851)
Excludes2 — not included here — inherited from T88
The conditions below are not part of T88.7XXA, but a patient may have both at the same time. When documentation supports it, T88.7XXA and the excluded code may both be reported.
- complication following infusion, transfusion and therapeutic injection (T80.-)
- complication following procedure NEC (T81.-)
- complications of anesthesia in labor and delivery (O74.-)
- complications of anesthesia in pregnancy (O29.-)
- complications of anesthesia in puerperium (O89.-)
- complications of devices, implants and grafts (T82-T85)
- complications of obstetric surgery and procedure (O75.4)
- dermatitis due to drugs and medicaments (L23.3, L24.4, L25.1, L27.0-L27.1)
- poisoning and toxic effects of drugs and chemicals (T36-T65 with fifth or sixth character 1-4)
- specified complications classified elsewhere
How long has T88.7XXA existed?
T88.7XXA has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.