ICD-10 Code S80.211: Abrasion, Right Knee – Complete Coding & Billing Guide

ICD-10 code S80.211 identifies an abrasion of the right knee and serves as the parent code for a family of three billable, 7-character codes used across all phases of patient care. Because S80.211 itself is a non-billable header, coders must always append the correct 7th character before submitting a claim. This guide covers correct code selection, documentation requirements, billing implications, common errors, and the real-world scenarios that trip up even experienced revenue cycle professionals.

What Does ICD-10 Code S80.211 Mean?

S80.211 designates a superficial injury — specifically an abrasion — to the right knee. An abrasion is a wound caused by friction or scraping that damages the outermost skin layers without penetrating the full dermis. This code belongs to Chapter 19 of ICD-10-CM (Injury, Poisoning, and Certain Other Consequences of External Causes), under the block S80–S89: Injuries to the Knee and Lower Leg, as defined by the ICD-10-CM Official Coding Guidelines.

Key attributes of this code family:

• S80.211 (header): Non-billable; requires a 7th character for claim submission
• S80.211A: Billable — initial encounter (active treatment phase)
• S80.211D: Billable — subsequent encounter (healing/recovery phase)
• S80.211S: Billable — sequela (late effect resulting from the original injury)
• Valid for all HIPAA-covered transactions since October 1, 2015
• Laterality specified: right knee only — do not use for left or unspecified knee

What Conditions and Diagnoses Does S80.211 Cover?

S80.211 applies to traumatic surface injuries of the right knee caused by friction, shear force, or contact with an abrasive surface — with no foreign body embedded and no full-thickness wound.

Clinical presentations appropriately captured under this code include:

• Road rash to the right knee from a fall off a bicycle or motorcycle
• Turf burn to the anterior right knee in athletic injuries (football, soccer, basketball)
• Pavement abrasion resulting from a pedestrian fall or slip-and-fall incident
• Occupational abrasion from crawling on rough surfaces (construction, flooring trades)
• Right knee scrape with superficial skin disruption, with or without minor bleeding

What Does This Code Specifically Exclude?

The S80 block carries a Type 2 Excludes notation for superficial injury of the ankle and foot — those injuries map to S90.- and cannot be captured here. Additionally, the following scenarios fall outside the scope of S80.211:

• Open wounds of the right knee involving full skin thickness (→ S81.01X-)
• Contusion (bruising without skin break) of the right knee (→ S80.01XA/D/S)
• Abrasion of the right lower leg below the knee (→ S80.811A/D/S)
• Foreign body embedded in the right knee wound (→ S80.251A/D/S)
• Burns or corrosions involving the right knee (→ T codes)

When Is S80.211 the Right Code to Use?

Choosing the correct code within this region requires matching the injury type, laterality, and encounter phase simultaneously. Apply S80.211 (with appropriate 7th character) when all of the following criteria are met:

1. The injury is a friction or scrape wound — the skin surface is disrupted but there is no full-thickness laceration or puncture
2. The affected anatomical site is the knee — not the lower leg, thigh, or ankle
3. Laterality is confirmed as right — documentation must explicitly state “right knee”
4. No foreign body is retained in the wound
5. The injury is traumatic in origin — not a skin breakdown from pressure, moisture, or a chronic condition (those code to L codes)
6. The 7th character accurately reflects the episode of care (A = active treatment, D = routine follow-up/healing, S = late effect)

How Does S80.211 Differ From the Most Commonly Confused Codes?

In practice, coders frequently encounter confusion between S80.211A and S80.01XA (contusion) because both involve the right knee and both are superficial. The clinical key is whether the skin surface is broken — an abrasion always involves disrupted epithelium; a contusion does not.

What Documentation Is Required to Support S80.211?

A well-documented note is the foundation of a defensible claim. Without clear provider documentation, auditors can and do reclassify or deny these encounters.

What Must the Provider Document in the Clinical Notes?

1. Explicit laterality — the note must state “right knee,” not just “knee” or “bilateral”
2. Injury type description — the provider should document “abrasion,” “scrape,” “road rash,” or equivalent clinical language confirming superficial friction injury
3. Mechanism of injury — how the abrasion occurred (fall, sports, occupational — supports medical necessity and external cause coding)
4. Wound characteristics — size (cm), depth (superficial vs. partial thickness), presence or absence of contamination, and infection status if applicable
5. Absence of foreign body — if S80.211 is used rather than S80.251, the note should confirm no embedded material was identified or removed
6. Treatment rendered — wound irrigation, debridement if performed, dressing applied; this supports CPT code pairing
7. Episode of care context — language such as “follow-up for healing right knee abrasion” supports the D suffix; “presenting today for right knee scrape sustained this morning” supports the A suffix

What Is the Documentation Standard for Inpatient vs. Outpatient Settings?

An important coding principle: “initial encounter” does not mean first visit to this specific provider. Per the ICD-10-CM Official Coding Guidelines, Section I.C.19.a, the A suffix applies throughout the entire active treatment phase, regardless of how many providers the patient has seen.

How Does S80.211 Affect Medical Billing and Claims?

S80.211A and its variants group into MS-DRG 604 (Trauma to the Skin, Subcutaneous Tissue, and Breast with MCC) and MS-DRG 605 (without MCC) for inpatient encounters. In outpatient settings, the code supports E&M services and minor procedure reimbursement where wound care is performed.

Key billing considerations:

• Do not submit S80.211 (without 7th character) on claims — it will be rejected as an invalid code under HIPAA transaction rules
• Do not include the decimal point when submitting electronically (submit as S80211A, not S80.211A)
• External cause codes from the V00–Y99 range should accompany the injury code to describe the mechanism (e.g., W18.40XA for unspecified fall)
• Medical necessity is generally established for wound evaluation and basic wound care when the abrasion is documented with appropriate depth, size, and clinical context

What CPT or Procedure Codes Are Commonly Billed With S80.211?

A frequent denial pattern: pairing 73564 (knee X-ray) with S80.211A alone without additional documentation of clinical necessity. Payers may flag an X-ray as inconsistent with a simple abrasion unless the note documents concern for underlying fracture or significant mechanism.

Are There Any Prior Authorization or Coverage Restrictions?

• Medicare: S80.211A is not subject to a National Coverage Determination (NCD); coverage is determined by medical necessity documentation at the claim level
• Medicaid: Varies by state; wound care services may require documentation of wound size, depth, and treatment plan
• Commercial payers: Most do not require prior authorization for initial ED or office evaluation; complex wound care (e.g., serial debridement) may trigger utilization review
• Workers’ Compensation: Requires mechanism-of-injury documentation and often a completed first report of injury form before claims process

What Coding Errors Should You Avoid With S80.211?

Auditors reviewing orthopedic, ED, and urgent care claims commonly flag the following errors associated with knee abrasion coding:

1. Submitting S80.211 without a 7th character — the most common error; S80.211 is a non-billable header and will be rejected by all payers
2. Using S80.219A (unspecified knee) when laterality is documented — if the provider clearly documents “right knee,” the coder is obligated to reflect that specificity; using unspecified is a diagnosis code specificity failure
3. Coding S80.01XA (contusion) instead of S80.211A (abrasion) — confusing bruising with surface skin disruption; the clinical note distinguishes these
4. Failing to append an external cause code — ICD-10-CM guidelines encourage (and some payers require) a mechanism code from the V00–Y99 range for traumatic injuries
5. Using the A suffix for routine wound check visits — if the patient is in the healing phase and returns only for wound check, the D suffix is appropriate
6. Applying S80.211 to the lower leg — the knee and lower leg are distinct anatomical sites; an abrasion below the patella on the tibial surface codes to S80.811-

What Do Auditors Look for When Reviewing Claims With S80.211?

• Confirmation that wound description in clinical notes matches “abrasion” (not laceration or contusion)
• Explicit right-side laterality in provider documentation
• Consistency between the 7th character used and the encounter type described in the note
• Presence of an external cause code when the mechanism is documented
• Appropriate CPT pairing — X-ray orders supported by clinical indication beyond the abrasion itself

How Does S80.211 Relate to Other ICD-10 Codes?

What Is the Correct Code Sequencing When S80.211 Appears With Other Diagnoses?

1. Sequencing rule: In outpatient settings, the injury code (S80.211A) is the principal diagnosis when the abrasion is the reason for the visit
2. External cause codes (mechanism + place of occurrence + activity + patient status) are sequenced after the injury code — never as the principal diagnosis
3. Infection: If the wound is infected, assign an additional code for the infection (e.g., L08.9 cellulitis/local skin infection) after the S code; the injury code sequences first
4. Multiple injuries: If the patient presents with both a right knee abrasion and a right knee contusion from the same incident, assign both codes — the Type 2 Excludes at the S80 block level permits concurrent use
5. Sequela coding (S suffix): When coding a sequela, the S80.211S code is sequenced first, followed by the code for the specific late effect (e.g., scar contracture, M79.89)

Real-World Coding Scenario — How S80.211 Is Applied in Practice

Patient encounter: A 34-year-old construction worker presents to urgent care after sliding on concrete during a workplace fall. The provider documents a 4 cm abrasion to the anterior right knee with mild skin disruption, no foreign material identified, and no underlying crepitus or joint instability. Wound irrigation and a non-adherent dressing were applied. The patient is advised to return in one week for wound check.

Correct Code Application

• S80.211A — Abrasion, right knee, initial encounter (active treatment, skin disruption documented, no foreign body, laterality confirmed)
• W18.40XA — Fall on same level, unspecified, initial encounter (external cause — mechanism)
• Y93.H9 — Activity, other involving exterior property (activity code)
• Y99.0 — Civilian activity done for income or pay (patient status code)
• 99213 — Office/outpatient visit, established complexity (E&M for evaluation and wound care)

Common Mistake in This Scenario

• Incorrect code assigned: S80.01XA (Contusion, right knee, initial encounter)
• Why it fails: The clinical note documents skin disruption and abrasion — not bruising with intact skin. A contusion code requires intact epithelium. Using S80.01XA misrepresents the wound type, which can trigger a medical record request and potential denial if the payer’s clinical edit flags the discrepancy between a contusion code and wound care CPT codes

Frequently Asked Questions About ICD-10 Code S80.211

Is ICD-10 Code S80.211 Billable?

S80.211 is not billable on its own — it is a non-specific header code that requires a 7th character to be valid for claim submission. Coders must use S80.211A (initial encounter), S80.211D (subsequent encounter), or S80.211S (sequela) depending on the phase of care. Submitting S80.211 without the 7th character will result in a claim rejection under HIPAA transaction standards.

What Is the Difference Between S80.211A and S80.211D?

S80.211A is used during the active treatment phase — when the provider is actively managing the wound, regardless of whether this is the first, second, or fifth visit. S80.211D applies during the healing and recovery phase, when the patient returns for routine monitoring of a wound that is already under appropriate management and no new intervention is required.

When Should I Use S80.219A Instead of S80.211A?

S80.219A (abrasion, unspecified knee) should be used only when the treating provider’s documentation genuinely does not identify the affected side. If the clinical note, operative report, or any other authenticated document in the record states “right knee,” the coder is required by diagnosis code specificity standards to assign S80.211A. Using S80.219A when laterality is available is a coding compliance deficiency that can surface during coding audit preparation.

Does S80.211A Require an External Cause Code?

External cause codes are strongly recommended and, in many settings, required by institutional policy or payer contract. Per the ICD-10-CM Official Coding Guidelines, external cause codes should be assigned to the fullest extent possible to describe the mechanism of injury, place of occurrence, activity, and patient status. While they are not mandatory for outpatient claim acceptance at the federal level, many payers and state programs require them, particularly for workers’ compensation and trauma registry reporting.

Is S80.211 Valid for ICD-10-CM Fiscal Year 2026?

The S80.211 code family has remained stable since its introduction in FY 2016 with no changes through the 2026 edition of ICD-10-CM, effective October 1, 2025. Coders should confirm code validity annually by consulting the CMS ICD-10-CM tabular update files published each spring, available at cms.gov.

What CPT Code Is Typically Paired With S80.211A for Wound Care?

The most common pairing is an E&M code (99213 or 99214 for office settings; 99283 or 99284 for the ED) when the visit is primarily for evaluation and basic wound care. If active debridement is performed, CPT 97597 (debridement, open wound, first 20 cm²) may be reported additionally. Coders should ensure the operative or procedure note supports the level of service selected.

Can S80.211A and S80.01XA Be Reported Together for the Same Knee?

Yes — because the S80 block uses a Type 2 Excludes notation rather than Type 1, it is permissible to report both an abrasion (S80.211A) and a contusion (S80.01XA) for the same knee encounter when the clinical documentation supports both distinct injury types from the same traumatic event. The provider note must independently describe both the surface abrasion and the associated bruising for dual coding to be defensible on audit.

Key Takeaways

• S80.211 is non-billable — always append A, D, or S before submitting claims
• The A suffix ≠ first visit — it means active treatment phase; use it throughout the entire treatment course
• Laterality matters — never default to the unspecified (S80.219) when the provider documents “right knee”
• Distinguish abrasions (skin disrupted) from contusions (S80.01XA) and lacerations (S81.011A) — documentation should drive the selection
• External cause codes should accompany every traumatic injury code to support medical necessity and meet payer and compliance requirements
• Common billing errors — submitting the header code without a 7th character, or pairing imaging CPT codes without clinical justification — are auditor targets for this code family
• The code has been stable since FY 2016 through ICD-10-CM 2026 with no description changes; confirm each October at cms.gov for any future updates

For deeper guidance on injury coding conventions, external cause assignment, and 7th character rules, consult the ICD-10-CM Official Coding Guidelines, Section I.C.19, published annually by CMS at cms.gov/medicare/coding-billing/icd-10-codes.