ICDcodes.org
FY2027

T88.3XXA — Malignant hyperthermia due to anesthesia, initial encounter

BillableCC

Is T88.3XXA billable?

Yes — T88.3XXA is billable for FY2027. T88.3XXA is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. T88.3XXA may be submitted for encounters from October 1, 2026 through September 30, 2027.

T88.3XXA at a glance

CodeT88.3XXA
DescriptionMalignant hyperthermia due to anesthesia, initial encounter
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027
7th character "A"initial encounter

What does the 7th character "A" mean in T88.3XXA?

In T88.3XXA, the 7th character A means initial encounter. The 7th character is required for T88.3XXA to be a valid, complete code.

Same condition, different episode of care — switch the 7th character:

Which MS-DRGs does T88.3XXA group to?

T88.3XXA sits in MDC 21 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 922Other Injury, Poisoning and Toxic Effect Diagnoses with MCCmedical
  • 923Other Injury, Poisoning and Toxic Effect Diagnoses without MCCmedical

As a secondary diagnosis, T88.3XXA is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.

How is T88.3XXA listed in the Alphabetic Index?

The Alphabetic Index lists these routes under T88.3, the nearest indexed parent of T88.3XXA. Use them to find the family, then select the specific code.

  • Hyperpyrexia › malignant, due to anesthetic
  • Hyperthermia › malignant, due to anesthesia (of unknown origin)
  • Complication › anesthesia, anesthetic › hyperthermia, malignant (s) (from) (of)
  • Complication › anesthesia, anesthetic › malignant hyperthermia (s) (from) (of)

Use additional code

Report an additional code alongside T88.3XXA to fully describe the condition. T88.3XXA is sequenced first.

  • code for adverse effect, if applicable, to identify drug (T41.- with fifth or sixth character 5)

Use additional code — inherited from Chapter 19

Report an additional code alongside T88.3XXA to fully describe the condition. T88.3XXA 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 T88.3XXA to fully describe the condition. T88.3XXA is sequenced first.

  • 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 devices involved and details of circumstances (Y62-Y82)

Use additional code — inherited from T88.3

Report an additional code alongside T88.3XXA to fully describe the condition. T88.3XXA is sequenced first.

  • code for adverse effect, if applicable, to identify drug (T41.- with fifth or sixth character 5)

Excludes2 — not included here — inherited from Chapter 19

The conditions below are not part of T88.3XXA, but a patient may have both at the same time. When documentation supports it, T88.3XXA and the excluded code may both be reported.

  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)

Excludes2 — not included here — inherited from T80-T88

The conditions below are not part of T88.3XXA, but a patient may have both at the same time. When documentation supports it, T88.3XXA 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 T88.3XXA, but a patient may have both at the same time. When documentation supports it, T88.3XXA 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 T88.3XXA existed?

T88.3XXA 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.