2027 ICD-10-CM Diagnosis Code T81.12XAPostprocedural septic shock, initial encounter

ICD-10-CM Codes›S00–T88›T80-T88›T81

ICD-10-CM T81.12XA
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

T81.12XA is a billable ICD-10-CM diagnosis code for postprocedural septic shock, 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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 791, 793, 919 through 921. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 165 closely related codes. The code is not accepted as a principal diagnosis by the Medicare Code Editor. Coders also document this condition as endotoxic shock. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication of other surgical or medical care, injury, initial encounter; Septicemia; and Shock.

T81.12XA no longer risk-adjusts for Medicare Advantage: it mapped to HCC 2 under the retired CMS-HCC V24 model through payment year 2025 but maps to no category in the live V28 model. It still risk-adjusts in the PACE (CMS-HCC V22) category 2, ESRD (V21) category 2, and ESRD (V24) category 2 for payment year 2027.

Code Identity

ICD-10-CM Code
T81.12XA
Billable Status
Yes — Valid for Submission
Code Describes
Postprocedural septic shock, initial encounter
Short Description
Postprocedural septic shock, initial encounter
Same as the full description in the CMS dataset.
Parent Code
T81.12
Postprocedural septic shock

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT80-T88Complications of surgical and medical care, not elsewhere classified
CategoryT81Complications of procedures, not elsewhere classified
This CodeT81.12XAPostprocedural septic shock, initial encounter

Code EditsBilling

Medicare Code Editor checks that affect claim validity for T81.12XA.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Medicare Risk Adjustment (HCC)Billing

T81.12XA no longer risk-adjusts for Medicare Advantage: it maps to no payment category in the live CMS-HCC V28 model, although it still risk-adjusts in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
Dropped in V28 see all codes that no longer risk-adjust
Prior Model (CMS-HCC V24)
HCC 2
V24 retired last contributed to a Medicare Advantage risk score in payment year 2025
Other CMS Models
PACE (CMS-HCC V22): HCC 2 · ESRD (V21): HCC 2 · ESRD (V24): HCC 2
ESRD V21 weights: 0.081 dialysis, 0.274–0.428 functioning graft · ESRD V24 weights: 0.087 dialysis, 0.270–0.532 functioning graft
Part D (RxHCC)
Not mapped
T81.12XA does not risk-adjust in the RxHCC prescription drug model

Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Endotoxic shock
  • Postoperative endotoxic shock
  • Postoperative sepsis
  • Postoperative septic shock
  • Postoperative shock
  • Postprocedural septic shock

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Complications of procedures, not elsewhere classified (T81). 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 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to T81.12XA: its own notes plus those printed at T81.12, T81.1, T81, block T80-T88, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From T81.1 Postprocedural shock applies to 12 codes
  • anaphylactic shock NOS (T78.2)
  • anaphylactic shock due to correct substance properly administered (T88.6)
  • anaphylactic shock due to serum (T80.5-)
  • electric shock (T75.4)
  • obstetric shock (O75.1)
  • shock due to anesthesia (T88.2)
  • shock following abortion or ectopic or molar pregnancy (O00-O07, O08.3)
  • traumatic shock (T79.4)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From T81 Complications of procedures, not elsewhere classified applies to 240 codes
From Block T80-T88 Complications of surgical and medical care, not elsewhere classified applies to 1,683 codes
  • 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)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Code First

The underlying condition named in the note is sequenced before this code.

From T81.12 Postprocedural septic shock applies to 3 codes
  • underlying infection

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From T81.12 Postprocedural septic shock applies to 3 codes
  • code, to identify any associated acute organ dysfunction, if applicable
From T81 Complications of procedures, not elsewhere classified applies to 240 codes
  • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
From Block T80-T88 Complications of surgical and medical care, not elsewhere classified applies to 1,683 codes
  • 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)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Notes

General instructions on how these codes are used.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

From T81 Complications of procedures, not elsewhere classified applies to 240 codes
  • The appropriate 7th character is to be added to each code from category T81
Values for category T81 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter this code
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name T81.12XA, its category, or a range that includes it.

Excludes1 5

These codes carry an Excludes1 note naming T81.12XA: they are not reported together with it, unless the two conditions are unrelated.

  • R55 Syncope and collapse
    postprocedural shock (T81.1-) names T81.1-, which includes this code
  • R57 Shock, not elsewhere classified
    postprocedural shock (T81.1-) names T81.1-, which includes this code
  • R65.21 Severe sepsis with septic shock
    postprocedural septic shock (T81.12-) names T81.12-, which includes this code
  • T79.4 Traumatic shock
    postprocedural shock (T81.1-) names T81.1-, which includes this code
  • T88.2 Shock due to anesthesia
    postprocedural shock NOS (T81.1-) names T81.1-, which includes this code

Excludes2 2

These codes carry an Excludes2 note naming T81.12XA: its condition is not part of those codes, and both may be reported when the patient has both.

  • I97 Intraoperative and postprocedural complications and disorders of circulatory system, not elsewhere classified
    postprocedural shock (T81.1-) names T81.1-, which includes this code
  • T88 Other complications of surgical and medical care, not elsewhere classified
    complication following procedure NEC (T81.-) names T81.-, which includes this code

Code First 1

These codes say to code first a condition named in the note, and T81.12XA is one of the conditions named.

  • J98.51 Mediastinitis
    underlying condition, if applicable, such as postoperative mediastinitis (T81.-) names T81.-, which includes this code

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 No · outpatient Yes
CCSR INF002
Septicemia
Default principal diagnosis: inpatient No · outpatient No
CCSR SYM003
Shock
Default principal diagnosis: inpatient No · outpatient No

Convert T81.12XA to ICD-9-CMHistory

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

ICD-9-CM
998.02 Postop shock, septic
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About T81.12XAOverview

What is the ICD-10 code for postprocedural septic shock, initial encounter?

The ICD-10-CM code for postprocedural septic shock, initial encounter is T81.12XA (sometimes written as T8112XA). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is T81.12XA (Postprocedural septic shock) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report postprocedural septic shock, initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character A in T81.12XA mean?

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

What MS-DRG does T81.12XA group to?

On inpatient claims, postprocedural septic shock, initial encounter maps to MS-DRG 793, 791, 920, 919, 921, with relative weights from 0.6719 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.

Is T81.12XA a CC or MCC?

CMS lists T81.12XA as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 165 closely related codes in its exclusion list.

Does T81.12XA risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage. T81.12XA mapped to HCC 2 in the retired CMS-HCC V24 model, which last determined payment in 2025, but it maps to no category in the live V28 model; see all codes that no longer risk-adjust. It still risk-adjusts in the PACE (CMS-HCC V22) category 2 (Septicemia/Sepsis/Systemic Inflammatory Response Syndrome/Shock), ESRD (V21) category 2 (Septicemia/Sepsis/Systemic Inflammatory Response Syndrome/Shock), and ESRD (V24) category 2 (Septicemia/Sepsis/Systemic Inflammatory Response Syndrome/Shock).