2027 ICD-10-CM Diagnosis Code S01.502DUnspecified open wound of oral cavity, subsequent encounter

ICD-10-CM Codes›S00–T88›S00-S09›S01

ICD-10-CM S01.502D
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

S01.502D is a billable ICD-10-CM diagnosis code for unspecified open wound of oral cavity, 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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 949 through 950. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury; and Open wounds of head and neck, subsequent encounter.

Code Identity

ICD-10-CM Code
S01.502D
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified open wound of oral cavity, subsequent encounter
Short Description
Unspecified open wound of oral cavity, subsequent encounter
Same as the full description in the CMS dataset.
Parent Code
S01.502
Unspecified open wound of oral cavity

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS00-S09Injuries to the head
CategoryS01Open wound of head
This CodeS01.502DUnspecified open wound of oral cavity, subsequent encounter

Present on Admission (POA)Billing

S01.502D is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Injuries to the head (S00-S09).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Avulsion of mandibular attached gingiva
  • Avulsion of mandibular vestibule
  • Avulsion of maxillary vestibule
  • Avulsion of tongue
  • Fracture of palatal process
  • Fracture of palate, open
  • Healing wound of periodontal tissue following dental trauma
  • Multiple open mouth wounds
  • Multiple open wounds of head
  • Open wound in mouth
  • Open wound of buccal mucosa
  • Open wound of gum
  • Open wound of mouth floor
  • Open wound of palate
  • Open wound of tongue

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 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 S01.502D: its own notes plus those printed at S01.5, S01, block S00-S09, 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.

From Block S00-S09 Injuries to the head applies to 1,934 codes
  • injuries of ear
  • injuries of eye
  • injuries of face [any part]
  • injuries of gum
  • injuries of jaw
  • injuries of oral cavity
  • injuries of palate
  • injuries of periocular area
  • injuries of scalp
  • injuries of temporomandibular joint area
  • injuries of tongue
  • injuries of tooth

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From S01 Open wound of head applies to 270 codes
  • open skull fracture (S02.- with 7th character B)

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.

From S01.5 Open wound of lip and oral cavity applies to 36 codes
From S01 Open wound of head applies to 270 codes
  • injury of eye and orbit (S05.-)
  • traumatic amputation of part of head (S08.-)
From Block S00-S09 Injuries to the head applies to 1,934 codes
  • burns and corrosions (T20-T32)
  • effects of foreign body in ear (T16)
  • effects of foreign body in larynx (T17.3)
  • effects of foreign body in mouth NOS (T18.0)
  • effects of foreign body in nose (T17.0-T17.1)
  • effects of foreign body in pharynx (T17.2)
  • effects of foreign body on external eye (T15.-)
  • frostbite (T33-T34)
  • insect bite or sting, venomous (T63.4)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From S01 Open wound of head applies to 270 codes
  • any associated:
  • injury of cranial nerve (S04.-)
  • injury of muscle and tendon of head (S09.1-)
  • intracranial injury (S06.-)
  • wound infection
From Block S00-S09 Injuries to the head applies to 1,934 codes
  • for any associated infection

Notes

General instructions on how these codes are used.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • 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.

From S01 Open wound of head applies to 270 codes
  • The appropriate 7th character is to be added to each code from category S01
Values for category S01 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter this code
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name S01.502D, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming S01.502D: they are not reported together with it, unless the two conditions are unrelated.

  • S00 Superficial injury of head
    open wound of head (S01.-) names S01.-, which includes this code

Code Also 3

These codes say S01.502D may also be needed to fully describe the condition. The note gives no sequencing direction.

  • S04 Injury of cranial nerve
    open wound of head (S01.-) names S01.-, which includes this code
  • S06 Intracranial injury
    open wound of head (S01.-) names S01.-, which includes this code
  • S09.1 Injury of muscle and tendon of head
    any associated open wound (S01.-) names S01.-, which includes this code

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DEN001
Any dental condition including traumatic injury
Default principal diagnosis: inpatient No · outpatient No
CCSR INJ048
Open wounds of head and neck, subsequent encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Mouth Disorders

Your mouth is one of the most important parts of your body. It has many different functions. It allows you to:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert S01.502D to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V58.89 Other specfied aftercare
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About S01.502DOverview

What is the ICD-10 code for unspecified open wound of oral cavity, subsequent encounter?

The ICD-10-CM code for unspecified open wound of oral cavity, subsequent encounter is S01.502D (sometimes written as S01502D). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is S01.502D (Unspecified open wound of oral cavity) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified open wound of oral cavity, subsequent encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character D in S01.502D mean?

The final character D marks a subsequent encounter: use it for routine care while the unspecified open wound of oral cavity is healing, after active treatment has ended.

What MS-DRG does S01.502D group to?

When unspecified open wound of oral cavity, subsequent encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 950, 949, with relative weights from 0.7661 to 1.1231 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S01.502D 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 unspecified open wound of oral cavity, subsequent encounter on inpatient claims. The code appears in the Injuries to the head (S00-S09) range of the CMS exempt list.