2026 ICD-10-CM Diagnosis Code T88.59XAOther complications of anesthesia, initial encounter

ICD-10-CM Codes›S00–T88›T80-T88›T88

ICD-10-CM T88.59XA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T88.59XA is a billable ICD-10-CM diagnosis code for other complications of anesthesia, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 917 through 918. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication of other surgical or medical care, injury, initial encounter.

Code Identity

ICD-10-CM Code
T88.59XA
Billable Status
Yes — Valid for Submission
Code Describes
Other complications of anesthesia, initial encounter
Short Description
Other complications of anesthesia, initial encounter
Same as the full description in the CMS dataset.
Parent Code
T88.59
Other complications of anesthesia

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT80-T88Complications of surgical and medical care, not elsewhere classified
CategoryT88Other complications of surgical and medical care, not elsewhere classified
This CodeT88.59XAOther complications of anesthesia, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abscess at puncture site due to and following peripheral nerve block
  • Anesthetic death
  • Complication due to and following neuromuscular block
  • Complication due to anesthesia during surgery
  • Complication of anesthesia
  • Complications of anesthesia during labor and delivery
  • Delayed recovery from general anesthesia
  • Excessive spread of local anesthetic
  • Failed epidural anesthesia
  • Failed neuraxial anesthesia
  • Failed regional anesthesia
  • Failed spinal anesthesia
  • Iatrogenic death
  • Inability to reverse neuromuscular block
  • Incomplete reversal of neuromuscular block
  • Infection after injection
  • Infection of deep tissue at puncture site due to and following peripheral nerve block
  • Injection site abscess
  • Injection site infection
  • Injection site mass
  • Local anesthetic block inadequate
  • Obstetric anesthesia problems
  • Obstetric anesthesia with cardiac complications
  • Obstetric anesthesia with central nervous system complication in childbirth
  • Obstetric anesthesia with central nervous system complications
  • Obstetrical complication of anesthesia
  • Obstetrical complication of anesthesia AND/OR sedation
  • Obstetrical complication of general anesthesia
  • Pain in area of anesthesia
  • Post procedure puncture site infection
  • Preoperative anesthetic death
  • Problem encountered during administration of local anesthetic
  • Prolonged neuromuscular block
  • Regional blockade - excessive cephalad spread of local anesthesia
  • Superficial puncture wound
  • Superficial soft tissue infection at site of neuraxial block
  • Superficial soft tissue infection at site of peripheral nerve block
  • Total spinal nerve blockade following local anesthetic injection
  • Unexpected resistance to neuromuscular blockade

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Other complications of surgical and medical care, not elsewhere classified (T88). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ037
Complication of other surgical or medical care, injury, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Anesthesia

Anesthesia is the use of medicines, called anesthetics, to prevent pain during surgery and other medical procedures. Medicine may be given by injection, inhalation, topical lotion, spray, eye drops, or a skin patch.

The full article covers:

  • What is anesthesia?
  • What is anesthesia used for?
  • What are the types of anesthesia?
  • What are the risks of anesthesia?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert T88.59XA to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
995.22 Adv eff anesthesia NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T88.59XAOverview

Is T88.59XA (Other complications of anesthesia) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other complications of anesthesia, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T88.59XA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for other complications of anesthesia, such as an emergency visit or first evaluation.

What MS-DRG does T88.59XA group to?

When other complications of anesthesia, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 917, 918, with relative weights from 0.8571 to 1.5684 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of T88.59XA?

Under the General Equivalence Mappings, other complications of anesthesia, initial encounter converts to ICD-9-CM 995.22 (adv eff anesthesia NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.