2026 ICD-10-CM Diagnosis Code S01.542APuncture wound with foreign body of oral cavity, initial encounter
S01.542A is a billable ICD-10-CM diagnosis code for puncture wound with foreign body of oral cavity, 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 11 through 13, 157 through 159, 963 through 965. Coders also document this condition as fishing hook in head. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury; and Open wounds of head and neck, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Fishing hook in head
- Fishing hook in mouth
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Open wound of head (S01). 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
Foreign Bodies
If you've ever gotten a splinter or had sand in your eye, you've had experience with a foreign body. A foreign body is something that is stuck inside you but isn't supposed to be there. You may inhale or swallow a foreign body, or you may get one from an injury to almost any part of your body.
Read the full article at MedlinePlus
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Convert S01.542A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S01.542AOverview
What is the ICD-10 code for puncture wound with foreign body of oral cavity, initial encounter?
The ICD-10-CM code for puncture wound with foreign body of oral cavity, initial encounter is S01.542A (sometimes written as S01542A). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is S01.542A (Puncture wound with foreign body of oral cavity) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report puncture wound with foreign body of oral cavity, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S01.542A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for puncture wound with foreign body of oral cavity, such as an emergency visit or first evaluation.
What MS-DRG does S01.542A group to?
When puncture wound with foreign body of oral cavity, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 11, 12, 13, 157, 158, 159, 963, 964, 965, with relative weights from 0.7085 to 5.4541 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of S01.542A?
Under the General Equivalence Mappings, puncture wound with foreign body of oral cavity, initial encounter converts to ICD-9-CM 873.70 (open wnd mouth NOS-compl), 873.71 (opn wnd buc mucosa-compl), and 873.72 (open wound gum-compl). The mapping is approximate, so confirm the match fits the documentation.
