2027 ICD-10-CM Diagnosis Code S81.051DOpen bite, right knee, subsequent encounter

ICD-10-CM Codes›S00–T88›S80-S89›S81

ICD-10-CM S81.051D
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

S81.051D is a billable ICD-10-CM diagnosis code for open bite, right knee, 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. Coders also document this condition as bite wound of right knee region. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Open wounds to limbs, subsequent encounter.

Code Identity

ICD-10-CM Code
S81.051D
Billable Status
Yes — Valid for Submission
Code Describes
Open bite, right knee, subsequent encounter
Short Description
Open bite, right knee, subsequent encounter
Same as the full description in the CMS dataset.
Parent Code
S81.051
Open bite, right knee

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS80-S89Injuries to the knee and lower leg
CategoryS81Open wound of knee and lower leg
This CodeS81.051DOpen bite, right knee, subsequent encounter

Present on Admission (POA)Billing

S81.051D is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Injuries to the knee and lower leg (S80-S89).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bite wound of right knee region
  • Dog bite of knee
  • Human bite of knee
  • Open wound of knee due to bite
  • Open wound of knee due to cat bite
  • Open wound of right knee due to animal bite
  • Open wound of right knee due to bite
  • Open wound of right knee due to cat bite
  • Open wound of right knee due to dog bite
  • Open wound of right knee due to human bite

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Open wound of knee and lower leg (S81). 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 S81.051D: its own notes plus those printed at S81.05, S81, block S80-S89, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Excludes1

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

From S81.05 Open bite of knee applies to 9 codes
From S81 Open wound of knee and lower leg applies to 108 codes
  • open fracture of knee and lower leg (S82.-)
  • traumatic amputation of lower leg (S88.-)

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 S81 Open wound of knee and lower leg applies to 108 codes
  • open wound of ankle and foot (S91.-)
From Block S80-S89 Injuries to the knee and lower leg applies to 4,680 codes
  • burns and corrosions (T20-T32)
  • frostbite (T33-T34)
  • injuries of ankle and foot, except fracture of ankle and malleolus (S90-S99)
  • 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 S81 Open wound of knee and lower leg applies to 108 codes
  • any associated wound 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 S81 Open wound of knee and lower leg applies to 108 codes
  • The appropriate 7th character is to be added to each code from category S81
Values for category S81 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 S81.051D, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming S81.051D: they are not reported together with it, unless the two conditions are unrelated.

  • S80.27 Other superficial bite of knee
    open bite of knee (S81.05-) names S81.05-, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming S81.051D: its condition is not part of those codes, and both may be reported when the patient has both.

  • S71 Open wound of hip and thigh
    open wound of knee and lower leg (S81.-) names S81.-, which includes this code

Code Also 3

These codes say S81.051D may also be needed to fully describe the condition. The note gives no sequencing direction.

  • S84 Injury of nerves at lower leg level
    any associated open wound (S81.-) names S81.-, which includes this code
  • S85 Injury of blood vessels at lower leg level
    any associated open wound (S81.-) names S81.-, which includes this code
  • S86 Injury of muscle, fascia and tendon at lower leg level
    any associated open wound (S81.-) names S81.-, which includes this code

Clinical ClassificationClinical

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

CCSR INJ049
Open wounds to limbs, subsequent encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Animal Bites

Wild animals usually avoid people. They might attack, however, if they feel threatened, are sick, or are protecting their young or territory. Attacks by pets are more common. Animal bites rarely are life-threatening, but if they become infected, you can develop serious medical problems.

Read the full article at MedlinePlus

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

Convert S81.051D 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 S81.051DOverview

What is the ICD-10 code for open bite, right knee, subsequent encounter?

The ICD-10-CM code for open bite, right knee, subsequent encounter is S81.051D (sometimes written as S81051D). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is S81.051D (Open bite, right knee) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report open bite, right knee, subsequent encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character D in S81.051D mean?

The final character D marks a subsequent encounter: use it for routine care while the open bite, right knee is healing, after active treatment has ended.

What MS-DRG does S81.051D group to?

When open bite, right knee, 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 S81.051D 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 open bite, right knee, subsequent encounter on inpatient claims. The code appears in the Injuries to the knee and lower leg (S80-S89) range of the CMS exempt list.