2026 ICD-10-CM Diagnosis Code T81.61XSAseptic peritonitis due to foreign substance accidentally left during a procedure, sequela
T81.61XS is a billable ICD-10-CM diagnosis code for aseptic peritonitis due to foreign substance accidentally left during a procedure, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 922 through 923. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
T81.61XS is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Aseptic peritoneal eosinophilia after dialysis
- Aseptic peritonitis
- Aseptic peritonitis following procedure
- Barium peritonitis
- Chemical peritonitis
- Chemical peritonitis due to and following a procedure
- Starch peritonitis
- Talc peritonitis
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 2026, published by CMS and the National Center for Health Statistics.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Chemical Peritonitis
a non-infectious inflammation of the peritoneum.
Patient EducationClinical
Peritoneal Disorders
Your peritoneum is the tissue that lines your abdominal wall and covers most of the organs in your abdomen. A liquid, peritoneal fluid, lubricates the surface of this tissue.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert T81.61XS to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T81.61XSOverview
Is T81.61XS a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report aseptic peritonitis due to foreign substance accidentally left during a procedure, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in T81.61XS mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the aseptic peritonitis due to foreign substance accidentally left during a procedure itself has resolved, not the original event.
What MS-DRG does T81.61XS group to?
When aseptic peritonitis due to foreign substance accidentally left during a procedure, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 922, 923, with relative weights from 1.0177 to 1.7494 depending on complications. Higher weights mean higher Medicare reimbursement.
Is T81.61XS exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for aseptic peritonitis due to foreign substance accidentally left during a procedure, sequela on inpatient claims.
What is the ICD-9 equivalent of T81.61XS?
Under the General Equivalence Mappings, aseptic peritonitis due to foreign substance accidentally left during a procedure, sequela converts to ICD-9-CM 909.3 (late eff surg/med compl). 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.
