2026 ICD-10-CM Diagnosis Code T17.390SOther foreign object in larynx causing asphyxiation, sequela
T17.390S is a billable ICD-10-CM diagnosis code for other foreign object in larynx causing asphyxiation, 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 913 through 914. The code is exempt from POA reporting. Coders also document this condition as choking caused by phlegm in larynx. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
T17.390S 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.
- Choking caused by phlegm in larynx
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Foreign body in respiratory tract (T17). 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.
Patient EducationClinical
Choking
Food or small objects can cause choking if they get caught in your throat and block your airway. This keeps oxygen from getting to your lungs and brain. If your brain goes without oxygen for more than four minutes, you could have brain damage or die.
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Convert T17.390S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T17.390SOverview
Is T17.390S (Other foreign object in larynx causing asphyxiation) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other foreign object in larynx causing asphyxiation, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in T17.390S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the other foreign object in larynx causing asphyxiation itself has resolved, not the original event.
What MS-DRG does T17.390S group to?
When other foreign object in larynx causing asphyxiation, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 913, 914, with relative weights from 0.8855 to 1.6346 depending on complications. Higher weights mean higher Medicare reimbursement.
Is T17.390S 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 other foreign object in larynx causing asphyxiation, sequela on inpatient claims.
What is the ICD-9 equivalent of T17.390S?
Under the General Equivalence Mappings, other foreign object in larynx causing asphyxiation, sequela converts to ICD-9-CM 908.5 (late eff FB in orifice). 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.
