2027 ICD-10-CM Diagnosis Code S10.12XABlister (nonthermal) of throat, initial encounter
S10.12XA is a billable ICD-10-CM diagnosis code for blister (nonthermal) of throat, 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 606 through 607, 963 through 965. Coders also document this condition as superficial injury of throat. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Superficial injury; contusion, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Superficial injury of throat
- Traumatic blister of neck
- Traumatic blister of throat
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Superficial injury of neck (S10). 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 S10.12XA: its own notes plus those printed at S10, block S10-S19, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- injuries of nape
- injuries of supraclavicular region
- injuries of throat
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.
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify any retained foreign body, if applicable (Z18.-)
Notes
General instructions on how these codes are used.
- 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.
- The appropriate 7th character is to be added to each code from category S10
- Ainitial encounter this code
- Dsubsequent encounter
- Ssequela
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Blisters
Blisters are fluid-filled sacs on the outer layer of your skin. They form because of rubbing, heat, or diseases of the skin. They are most common on your hands and feet.
The full article covers:
- What are blisters?
- What causes blisters?
- What are the treatments for blisters?
- Can blisters be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert S10.12XA to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S10.12XAOverview
What is the ICD-10 code for blister (nonthermal) of throat, initial encounter?
The ICD-10-CM code for blister (nonthermal) of throat, initial encounter is S10.12XA (sometimes written as S1012XA). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is S10.12XA (Blister (nonthermal) of throat) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report blister (nonthermal) of throat, initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What does the 7th character A in S10.12XA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for blister (nonthermal) of throat, such as an emergency visit or first evaluation.
What MS-DRG does S10.12XA group to?
When blister (nonthermal) of throat, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 964, 965, 607, 963, 606, with relative weights from 0.8772 to 2.6361 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of S10.12XA?
Under the General Equivalence Mappings, blister (nonthermal) of throat, initial encounter converts to ICD-9-CM 910.2 (blister head). The mapping is approximate, so confirm the match fits the documentation.
