2026 ICD-10-CM Diagnosis Code S01.312DLaceration without foreign body of left ear, subsequent encounter
S01.312D is a billable ICD-10-CM diagnosis code for laceration without foreign body of left ear, subsequent encounter. The 7th character D marks it as a subsequent encounter code, used during routine care in the healing or recovery phase. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 949 through 950. The code is exempt from POA reporting. Coders also document this condition as complex laceration of auricle of ear. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Open wounds of head and neck, subsequent encounter.
Code Identity
Code Classification
Present on Admission (POA)Billing
S01.312D 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.
- Complex laceration of auricle of ear
- Complex laceration of left pinna
- Cut of ear region
- Cut of skin of ear
- Cut of skin of left ear
- Laceration of left ear region
- Simple laceration of auricle of ear
- Simple laceration of left pinna
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
Ear Disorders
Your ear has three main parts: outer, middle and inner. You use all of them in hearing. Sound waves come in through your outer ear. They reach your middle ear, where they make your eardrum vibrate. The vibrations are transmitted through three tiny bones, called ossicles, in your middle ear.
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Convert S01.312D to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S01.312DOverview
Is S01.312D (Laceration without foreign body of left ear) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report laceration without foreign body of left ear, subsequent encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character D in S01.312D mean?
The final character D marks a subsequent encounter: use it for routine care while the laceration without foreign body of left ear is healing, after active treatment has ended.
What MS-DRG does S01.312D group to?
When laceration without foreign body of left ear, subsequent encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 949, 950, with relative weights from 0.6277 to 1.1897 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S01.312D 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 laceration without foreign body of left ear, subsequent encounter on inpatient claims.
What is the ICD-9 equivalent of S01.312D?
Under the General Equivalence Mappings, laceration without foreign body of left ear, subsequent encounter converts to ICD-9-CM V58.89 (other specfied aftercare). 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.
