17004

🔥 CPT 17004 — Destruction, Premalignant Lesions; 15 or More Lesions

Quick Reference

wRVU: 1.30 | Global Period: 010 (10 days) | Assistant Payable: ❌ No | Bilateral Indicator: 1

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📋 Clinical Description

CPT 17004 describes the destruction of 15 or more premalignant skin lesions in a single patient encounter, using any recognized destructive modality — including cryosurgery (liquid nitrogen), electrosurgery, laser surgery, chemosurgery, or surgical curettement. This is a flat-rate, single-line code that replaces the 17000 + 17003 combination entirely once the lesion count reaches 15 in a session; it is the ceiling code in the three-code premalignant destruction family (17000 → 17003 → 17004). Critically, 17004 may only be billed once per date of service regardless of how many lesions above 15 are treated — there is no stacking mechanism above this code.

Actinic keratosis (AK) — the prototypical premalignant lesion driving high-volume destruction sessions — is a squamous intraepithelial dysplasia caused by cumulative UV radiation exposure; discrete AKs represent focal keratinocyte atypia with an estimated 0.1-10% annual individual risk of progression to invasive squamous cell carcinoma. Patients with high UV burden, personal history of skin cancer, fair skin, or immunosuppression commonly present with 15 or more AKs across large cosmetic and functional zones including the scalp, face, ears, dorsal hands, and arms — necessitating a comprehensive single-session destruction approach. When any individual lesion in the session is confirmed or suspected malignant on biopsy, the malignant excision family (11640-11646) or Mohs codes (17311-17315) apply to that lesion specifically, not 17004.

This procedure may be performed in the following clinical contexts:

• High-volume AK session in a heavily sun-damaged patient — 15 or more discrete AKs documented across multiple anatomic zones and destroyed in a single visit; the flat-rate 17004 is reported regardless of whether 15 or 40 lesions are treated.
• Annual or semi-annual “field clearance” in a patient with prior skin cancer history — Patients with personal history of BCC, SCC, or melanoma (Z85.828) frequently require aggressive preventive AK management; 17004 supports medical necessity in this high-risk population.
• Periocular AK destruction in an ophthalmology setting — When an ophthalmologist or oculoplastic surgeon treats 15 or more periocular and facial AKs in a session, 17004 applies; eyelid-specific modifiers (-E1--E4) are not applicable to a flat-rate multi-lesion code but laterality modifiers (-RT, -LT) may be used for documentation purposes.
• Combined session: premalignant AND benign lesion destruction — When both AKs (premalignant) and benign lesions such as seborrheic keratoses (benign) are destroyed in the same session, 17004 covers the 15+ AKs and 17111 covers 15+ benign lesions separately; a NCCI edit exists between these families and modifier -59 (or -XS) is required to report both.
• Immunosuppressed patient with extensive AK burden — Transplant recipients and patients on long-term immunosuppressives develop AKs at significantly accelerated rates; 17004 with documented lesion count and immunosuppression context supports medical necessity for payer review.

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🔬 Anatomical & Procedural Considerations

Modality	Mechanism / Steps	Key Notes
Cryotherapy (Liquid Nitrogen)	Liquid nitrogen applied via spray gun or cotton-tip applicator to each lesion; freeze-thaw cycle destroys dysplastic keratinocytes via intracellular ice crystal formation	Most common modality for high-volume AK sessions; the operative note must document the modality used and a clear lesion count — “cryotherapy applied to 17 AKs; sites include scalp, bilateral cheeks, right ear, bilateral dorsal hands”
Electrosurgery / Electrodesiccation	High-frequency electrical current applied to each lesion; tissue is destroyed via resistive heating; curettement may follow to debride necrotic material	Acceptable modality for 17004; documentation must confirm tissue destruction (not excision) — if the lesion is cut out rather than destroyed in situ, excision codes apply
Laser Surgery (CO₂ / Er:YAG)	Ablative laser vaporizes the dysplastic epidermis at each lesion site; used when precision is required (e.g., periocular or perioral AKs)	Laser use does not change the code — 17004 applies regardless of modality; document laser type, settings, and each site treated
Chemical Destruction	Topical caustic agent (e.g., trichloroacetic acid) applied to each discrete lesion in-office under provider supervision	Distinct from at-home field therapy (5-FU, imiquimod) — patient self-applied topical field agents are drug management encounters, not 17004 services; in-office provider-applied chemical destruction qualifies
Surgical Curettement	Mechanical scraping of each dysplastic lesion with a dermal curette	Valid modality for 17004; must be applied to premalignant lesions only — curettement of malignant lesions maps to the malignant destruction or excision code families

Clinical Pearl

The single most important documentation requirement for CPT 17004 is an explicit lesion count of 15 or more in the procedure note or operative record. Documenting “multiple AKs treated” or “extensive cryotherapy performed” without a specific count is insufficient to defend 17004 on audit — payers will downcode to 17000 (1 lesion) if count is absent. Best practice: the provider should enumerate each lesion site in the note, e.g., “3 scalp, 2 right cheek, 2 left cheek, 1 nose, 2 right ear, 2 dorsal right hand, 3 dorsal left hand = 15 total.” CMS has specifically identified excessive units of 17000/17003/17004 as a RAC audit target, and per CMS policy, 17004 may be billed only once per date of service.

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✅ Procedure Includes

• Clinical identification, inspection, and mapping of all lesion sites to be treated prior to the session
• Skin preparation at each treatment site (cleansing, marking)
• Application of the destructive modality to each of the 15 or more premalignant lesions
• Routine wound care at all treatment sites following destruction
• Standard post-procedure patient instructions (wound care, sun protection guidance, return precautions)
• Documentation of modality used, total lesion count, and individual lesion sites — required for audit defense and medical necessity support
• All pre-procedure and intra-procedure assessment related to the AK destruction session

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❌ Excludes / Do Not Report Together

Code	Description	Relationship to 17004
17000	Destruction, premalignant lesion; first lesion	Mutually exclusive in the same session — when 15 or more premalignant lesions are destroyed, report only 17004; do NOT report 17000 + 17003 + 17004 together
17003	Destruction, premalignant lesions; second through 14th lesion, each (add-on)	Mutually exclusive in the same session when 15+ lesions are treated; 17003 is only used when the total lesion count is 2-14; once the 15th lesion is reached, 17004 replaces the entire 17000/17003 stack
17110	Destruction, benign lesions other than skin tags or cutaneous vascular lesions; up to 14 lesions	Different lesion category — benign lesions (seborrheic keratoses, verrucae, etc.) are reported under 17110/17111, NOT 17004; a NCCI edit exists between the two families; when both benign AND premalignant lesions are treated in the same session, modifier -59 or -XS is required to report both code families
17111	Destruction, benign lesions; 15 or more lesions	When 15+ benign lesions AND 15+ premalignant lesions are each treated in the same session, report both 17004 and 17111 with modifier -59 on the lower-valued code to bypass the NCCI edit; document the distinct lesion types clearly in the note
17311-17315	Mohs micrographic surgery	When any lesion in the session is treated with Mohs technique, the Mohs code family replaces the destruction code for that specific lesion; 17004 may still apply to the remaining premalignant lesions if 15+ meet the flat-rate threshold outside of the Mohs lesion
E/M codes (992xx / 920xx)	Office visit, any level	Separately reportable only when modifier -25 is appended to the E/M code, documenting a significant, separately identifiable E/M service beyond the pre-procedure assessment for the AK session

Bundling Alert — Global Period is 010, Not 090 or 000

CPT 17004 carries a 10-day global surgical package, identical to 17000. All routine post-procedure wound checks, follow-up visits for treated lesion sites, and suture/blister care within Days 1-10 are bundled into the 17004 payment — do not report E/M codes for these visits. This is shorter than the 90-day global for major excision codes (11646) but is still an active global period that requires active tracking. After Day 10, services for conditions related to the AK destruction are separately billable. For any E/M visit within the 10-day window for a condition unrelated to the AK destruction, append modifier -24 to the E/M code and explicitly document the unrelated nature in the visit note. The most common billing error: scheduling a routine follow-up skin check within 10 days of the 17004 session and billing it as a separate E/M without -24, triggering a bundling denial or recoupment.

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🌳 Code Tree — Surgery: Integumentary System, Destruction - Premalignant Lesions

CPT 17000-17004  Destruction — Premalignant Lesions
│
├── 17000  Destruction, premalignant lesion; first lesion  (Global: 010)
├── 17003  Second through 14th lesion, each [Add-On — list separately]  (Global: N/A)
└── ▶▶ 17004 ◀◀  15 or more lesions  ← YOU ARE HERE  (Global: 010)

CPT 17110-17111  Destruction — Benign Lesions (not skin tags or vascular)
├── 17110  Up to 14 lesions  (Global: 010)
└── 17111  15 or more lesions  (Global: 010)

CPT 17106-17108  Destruction — Cutaneous Vascular Proliferative Lesions
├── 17106  Less than 10 sq cm  (Global: 090)
├── 17107  10.0-50.0 sq cm  (Global: 090)
└── 17108  Over 50.0 sq cm  (Global: 090)

CPT 17311-17315  Mohs Micrographic Surgery — Head, Neck, Hands, Feet, Genitalia
├── 17311  First stage, up to 5 tissue blocks
├── 17312  Each additional stage (add-on)
├── 17313  First stage, up to 5 tissue blocks — trunk, arms, legs
├── 17314  Each additional stage, trunk, arms, legs (add-on)
└── 17315  Each additional block beyond 5 per stage (add-on)

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💰 RVU & Reimbursement Profile

Component	Value
Work RVU (wRVU)	1.30 (verify against current CMS MPFS for applicable year)
Global Period	010 (10 days)
Bilateral Indicator	1 — Subject to standard 150% bilateral payment adjustment rules
Assistant Surgeon	❌ Not payable
Co-Surgeon	❌ Not applicable
Team Surgery	❌ Not applicable
PC/TC Split	❌ No — procedure code only (Indicator 0)
Modifier -51 Exempt	No
Units Per Date of Service	1 unit maximum — CMS policy explicitly limits 17004 to one unit per date of service; billing more than 1 unit is a recoverable overpayment per CMS RAC guidance
Anesthesia	Topical or local infiltration anesthesia included; no separate anesthesia billing expected for standard office-based AK destruction

Bilateral Billing Rules

17004 has a bilateral indicator of 1, making it technically subject to the standard 150% bilateral adjustment — however, in clinical practice, 17004 is almost never billed with modifier -50. This is because the code is already a flat-rate, per-session code that covers all lesions treated regardless of laterality or body location. Counting AKs on both sides of the face, both ears, and both hands still results in a single unit of 17004 for the session — there is no separate billing by side. Use -RT/-LT modifiers only when a specific MAC or payer requires anatomic documentation for individual periocular lesions, particularly in an ophthalmology setting.

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🏷️ Modifier Reference

Modifier	Name	When to Apply
-RT	Right Side	When documentation of specific laterality is required by a payer or for periocular AK sessions involving right-sided eyelid structures; uncommon for flat-rate multi-site 17004
-LT	Left Side	Same as -RT — laterality documentation for left-sided specific anatomic sites when payer requires
-25	Significant, Separately Identifiable E/M	Applied to the E/M code — not 17004 — when a separate, medically necessary office visit with distinct clinical decision-making is performed on the same date as the AK destruction session; E/M documentation must stand independently of the pre-procedure assessment
-24	Unrelated E/M During Postoperative Period	Applied to the E/M code when a patient returns within the 10-day global window for a condition unrelated to the AK destruction; document the unrelated nature explicitly in the visit note
-59	Distinct Procedural Service	Required when 17004 is reported on the same date as a benign lesion destruction code (17111) to bypass the NCCI edit; documents that the two services address distinct lesion types (premalignant vs. benign) at the same or different sites
-XS	Separate Structure (X-modifier subset of -59)	Preferred alternative to -59 by some MACs when 17004 and 17111 are reported together; documents distinct lesion populations; verify MAC preference
-51	Multiple Procedures	When 17004 is performed alongside another surgical procedure (not from the same family) at the same session; apply to the lower-valued code
-52	Reduced Services	Procedure session partially completed — document reason and approximate count of lesions treated relative to planned count
-53	Discontinued Procedure	Session stopped due to patient safety concern before completion — document the reason and lesion count at time of discontinuation

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🩺 Common ICD-10-CM Pairings

Primary — Actinic Keratosis and Premalignant Skin Changes

ICD-10 Code	Description	HCC?	Clinical Notes
L57.0	Actinic keratosis	❌ No	Primary diagnosis for the vast majority of 17004 encounters; no laterality or site-level ICD-10 specificity required — L57.0 is complete as coded; the lesion count, sites, and modality belong in the procedure documentation, not the ICD-10 code
L57.1	Actinic reticuloid	❌ No	Chronic photosensitivity reaction with AK-like dysplastic features; less common; use only when the dermatologist specifically documents this diagnosis rather than standard AK
L57.8	Other skin changes due to chronic exposure to nonionizing radiation	❌ No	Use for UV-induced premalignant skin changes that do not precisely meet the L57.0 AK descriptor; includes poikiloderma of Civatte and related actinic injury patterns when provider documents these specifically
L57.9	Skin changes due to chronic exposure to nonionizing radiation, unspecified	❌ No	Least specific in the L57 category; use only when documentation does not support L57.0-L57.8 even after a provider query attempt

Supporting / High-Risk Context Codes

ICD-10 Code	Description	HCC?	Clinical Notes
Z85.828	Personal history of other malignant neoplasm of skin	❌ No	Highly relevant secondary diagnosis for 17004 encounters — patients with prior BCC, SCC, or melanoma history are at significantly elevated AK burden and risk; this code supports medical necessity for aggressive high-volume AK destruction and should be queried/captured when documented in the chart
Z77.098	Contact with and (suspected) exposure to other hazardous, chiefly nonmedicinal, chemicals (UV)	❌ No	Applicable when chronic occupational or recreational UV exposure is explicitly documented as a contributing factor; most useful for outdoor workers (agriculture, construction, maritime)
L55.9	Sunburn, unspecified	❌ No	Occasionally documented concurrently when acute UV exposure is part of the clinical picture at the same visit; typically not a primary driver for AK destruction billing but may be reported as an additional code when separately addressed
D04.9	Carcinoma in situ of skin, unspecified	❌ No	Report as primary or additional diagnosis when the provider documents in-situ squamous carcinoma (Bowen disease) among the lesions treated — this is a premalignant/in-situ designation that supports use of the 17000 family; when invasive malignancy is confirmed, shift to excision or Mohs codes

Eyelid-Specific Context (Ophthalmology Setting)

ICD-10 Code	Description	HCC?	Clinical Notes
L57.0	Actinic keratosis	❌ No	L57.0 applies uniformly regardless of anatomic site — there is no eyelid-specific AK code within the L57 family; document eyelid involvement in the clinical note; anatomic specificity** is captured via CPT modifiers (E1-E4, RT, LT) rather than ICD-10-CM laterality coding for this diagnosis

Coding Specificity Reminder

ICD-10-CM category L57 does not require laterality, site specificity, or lesion count at the code level — L57.0 is a fully valid, non-extendable code. However, the clinical and billing documentation must clearly establish the number of lesions (15 or more, specified in the procedure note) and the medical necessity for high-volume destruction (e.g., prior skin cancer history, immunosuppression, high actinic damage burden). Payer audits for 17004 focus on the CPT documentation, not the ICD-10-CM code — but reporting a secondary diagnosis like Z85.828 alongside L57.0 strengthens the medical necessity narrative significantly for high-volume sessions.

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🏥 MS-DRG Considerations (Inpatient)

Inpatient Coding Reminder

CPT 17004 is performed exclusively in the outpatient or office setting. There are no routine MS-DRG assignments for this procedure — inpatient admission for AK destruction would not be supported by any payer, MAC, or utilization review body. If a patient undergoing inpatient admission for an unrelated diagnosis also has premalignant lesion destruction performed, an ICD-10-PCS code may be assigned for facility completeness, but it will have no meaningful impact on DRG grouping. For inpatient admissions driven by melanoma or advanced SCC with systemic involvement, refer to MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast) — DRGs 573-578 — for DRG mapping of the primary admission, not the AK session.

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🔧 ICD-10-PCS Equivalents (Inpatient Facility Coding)

Note

PCS coding for high-volume AK destruction in an inpatient context is exceedingly rare and carries no meaningful DRG impact. The correct PCS root operation is Destruction (5) — physical eradication of all or a portion of a body part by direct use of energy, force, or destructive agent — consistent with cryotherapy, electrosurgery, and laser ablation. Because ICD-10-PCS does not have a “per lesion count” axis, each anatomic body part treated requires its own PCS code line; there is no PCS equivalent to the CPT flat-rate 17004 concept. Assign one code per distinct body part value treated.

PCS Code	Full Description	Applicable Modality
0H50XZZ	Destruction of Scalp Skin, External Approach, No Device, No Qualifier	Cryotherapy / electrosurgery / laser — scalp AKs
0H51XZZ	Destruction of Face Skin, External Approach, No Device, No Qualifier	Any destruction modality — facial AKs (cheek, forehead, nose, chin, temple)
0H52XZZ	Destruction of Right Ear Skin, External Approach, No Device, No Qualifier	Right auricular / periauricular AK destruction
0H53XZZ	Destruction of Left Ear Skin, External Approach, No Device, No Qualifier	Left auricular / periauricular AK destruction
0H54XZZ	Destruction of Right Upper Eyelid, External Approach, No Device, No Qualifier	Right upper eyelid periocular AK
0H55XZZ	Destruction of Left Upper Eyelid, External Approach, No Device, No Qualifier	Left upper eyelid periocular AK
0H5AXZZ	Destruction of Right Hand Skin, External Approach, No Device, No Qualifier	Dorsal right hand AK destruction — common high-volume site
0H5BXZZ	Destruction of Left Hand Skin, External Approach, No Device, No Qualifier	Dorsal left hand AK destruction

PCS Character Analysis — 0H51XZZ

Position	Character	Value	Definition
1	Section	0	Medical and Surgical
2	Body System	H	Skin and Breast
3	Root Operation	5	Destruction (physical eradication of all or a portion of a body part by direct use of energy, force, or destructive agent)
4	Body Part	1	Skin, Face
5	Approach	X	External (procedure performed directly on the skin surface)
6	Device	Z	No Device
7	Qualifier	Z	No Qualifier

PCS Root Operation: Destruction (5) vs. Excision (B)

• Use Destruction (5) when lesions are eradicated in situ using energy, cold, chemical, or mechanical means — no tissue specimen is removed or sent to pathology; this is the correct root operation for all cryotherapy, electrodesiccation, laser ablation, and chemical destruction of AKs.
• Use Excision (B) when a portion of the skin body part is physically cut out and removed — applicable to shave removals, punch biopsies, or tangential excisions sent for pathology evaluation.
• When multiple AK sites are treated, assign separate PCS code lines for each distinct body part — PCS has no equivalent to the CPT “15+ lesion flat rate” concept; each body part value (scalp, face, right ear, left ear, etc.) requires its own PCS code line regardless of the number of lesions within that body part.

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📝 Coding Examples

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Example 1 — Office: 15 AKs, Cryotherapy, with Separate E/M for Unrelated Complaint

Clinical Scenario: A 69-year-old established female with a personal history of BCC of the right cheek presents for a comprehensive skin check. The dermatologist identifies and destroys 15 discrete actinic keratoses across the scalp (4), bilateral cheeks (3), right ear (2), forehead (3), and bilateral dorsal hands (3) using liquid nitrogen. The note reads: “Cryotherapy applied to 15 AKs; sites as enumerated above; single freeze-thaw cycle per lesion, approximately 8 seconds each.” The physician also separately evaluates a new pruritic rash on the patient’s back, documented with independent history, exam, and assessment/plan, and prescribes triamcinolone cream.

Field	Code	Rationale
CPT 1	17004	15 premalignant lesions destroyed in a single session — flat-rate 17004 replaces 17000 + 17003 entirely at the 15-lesion threshold; reported as 1 unit
CPT 2	99213-25	Established patient E/M, low complexity; modifier -25 on the E/M code for the separately documented evaluation of the new back rash; NOT appended to 17004
PDx	L57.0	Actinic keratosis — primary reason for the 17004 session
SDx	Z85.828	Personal history of malignant neoplasm of skin — supports medical necessity for high-volume AK management
SDx	L30.9	Dermatitis, unspecified — diagnosis supporting the separately billed E/M for the back rash

Note

Modifier -25 belongs on the E/M code (99213), not on 17004. The E/M documentation must independently support a distinct, medically necessary service beyond the pre-procedure AK assessment — here, the separately documented back rash evaluation clearly qualifies. If the E/M note only addressed pre-procedure assessment for the AK session, the E/M would be bundled and not separately billable.

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Example 2 — Office: 17 AKs + 16 Seborrheic Keratoses, Same Session

Clinical Scenario: A 74-year-old male with extensive photodamage and immunosuppression (renal transplant) presents for a comprehensive destruction session. The dermatologist destroys 17 actinic keratoses (cryotherapy) and 16 seborrheic keratoses (electrodesiccation) in the same visit. The note clearly enumerates each lesion type by count and site, documenting modality for each group. No separate E/M is documented beyond the pre-procedure assessment.

Field	Code	Rationale
CPT 1	17004	17 premalignant lesions (AKs) destroyed — flat-rate code for 15+ premalignant lesions; 1 unit only
CPT 2	17111-59	16 benign lesions (seborrheic keratoses) destroyed — 15+ benign lesion code; modifier -59 required on the lower-valued code to bypass the NCCI bundling edit between the premalignant and benign destruction families
PDx	L57.0	Actinic keratosis — primary diagnosis; highest medical necessity burden
SDx	L82.1	Other seborrheic keratosis — diagnosis supporting 17111
SDx	Z85.828	Personal history of malignant neoplasm of skin — documents elevated risk context supporting the scope of the session

Warning

A NCCI edit exists between the premalignant destruction family (17000/17004) and the benign destruction family (17110/17111). Without modifier -59 (or XS per MAC preference) on the lower-valued code, the second code will be bundled and denied. The operative note must clearly distinguish the two lesion populations by type (premalignant vs. benign), count, and site — without this distinction in the documentation, the modifier cannot be defended on audit.

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Example 3 — Office: 22 AKs, Field Clearance — Global Period and Re-Treatment Scenario

Clinical Scenario: A 77-year-old male with a prior history of SCC of the scalp presents on April 1st for field clearance cryotherapy; the physician destroys 22 AKs documented by count and site. On April 8th — Day 7, within the 10-day global window — the patient calls with a wound question and is brought in for a brief wound check for blister formation on the scalp. On April 12th — Day 11, outside the global window — the patient returns for a routine E/M and the physician identifies 3 new AKs and treats them with cryotherapy.

Field	Code (April 1st)	Rationale
CPT 1	17004	22 premalignant lesions, single session — 17004, 1 unit; 10-day global period opens
PDx	L57.0	Actinic keratosis
SDx	Z85.828	Personal history of malignant neoplasm of skin (prior scalp SCC)

Field	Code (April 8th — Day 7, In Global)	Rationale
No CPT billed	—	Wound check for blister formation is bundled into the 17004 global period; no separate E/M or procedure code is billable for wound-related follow-up within Days 1-10

Field	Code (April 12th — Day 11, Outside Global)	Rationale
CPT 1	17000	3 new AKs treated — below the 15-lesion threshold; report 17000 for the first lesion
CPT 2	17003 × 2	2 additional lesions (lesions 2 and 3); add-on code, 2 units
CPT 3	99213	Established patient E/M — separately billable because Day 11 is outside the 10-day global window of the April 1st 17004; no modifier needed
PDx	L57.0	Actinic keratosis

Note

Global period reminder: The 10-day global window for the April 1st 17004 runs through April 11th. The April 8th wound check is bundled — do not bill. The April 12th visit falls on Day 11, outside the global window, making the E/M and the new AK treatments separately and fully billable without a global modifier. Always track the exact calendar date; a Day 10 vs. Day 11 calculation error is a common billing workflow failure.

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⚠️ Common Coding Pitfalls

• Stacking 17000 + 17003 beyond the 14-lesion cap instead of switching to 17004: The 15-lesion threshold is a hard switch point — once the 15th premalignant lesion is treated in a session, only 17004 is reported and the 17000/17003 stack is abandoned entirely. Continuing to stack 17000 + 13 units of 17003 when a 15th lesion was treated — effectively billing 17000 + 17003 × 13 instead of 17004 alone — creates a recoverable overpayment. CMS explicitly limits 17003 to 13 units per date of service (covering lesions 2-14) and limits 17004 to 1 unit per date of service.

• Billing more than 1 unit of 17004 per date of service: CPT 17004 is a flat-rate per-session code — it covers all premalignant lesions destroyed in the session regardless of total count above 15. Billing 17004 × 2 units (e.g., attempting to bill separately for two anatomic zones) is a direct violation of CMS billing policy and is a RAC audit recovery target. One unit per date of service, period.

• Missing the explicit lesion count in documentation: “Multiple AKs treated with cryotherapy” is not sufficient documentation to support 17004. Payers — including Medicare — require a specific count of 15 or more lesions documented in the procedure note, with individual sites enumerated. Without a countable lesion list, the claim will be downcoded to 17000 (1 lesion, wRVU 0.61) on audit, representing a significant reimbursement reduction and potential overpayment recovery.

• Reporting 17004 for benign lesions (seborrheic keratoses, warts): CPT 17004 is strictly for premalignant lesions — the diagnosis code L57.0 (actinic keratosis) is the primary clinical driver. Seborrheic keratoses, verrucae, and molluscum contagiosum are benign lesions that map to the 17110/17111 family. Applying 17004 to benign lesions is a diagnosis-procedure mismatch that will fail on NCCI edit review and constitutes a compliance violation when done systematically.

• Billing a separate E/M for the pre-procedure assessment without a truly distinct service: The pre-procedure evaluation, lesion mapping, and clinical decision-making for the AK session are bundled into the 17004 payment. An E/M with modifier -25 is only separately payable when the provider performs a clinically distinct evaluation for a separate problem — documented with its own history, exam, and medical decision-making. A note that reads only “patient presents for AK treatment, 22 lesions treated” without a separately identifiable E/M section will not support a -25 E/M on audit.

• Failing to track the 10-day global window after a 17004 session: The 10-day global is short but active. High-volume dermatology practices scheduling routine follow-up skin checks or biopsy visits within 10 days of a 17004 session risk automatically generating E/M claims that are actually bundled. Implement a 10-day flag in your scheduling and billing system at the time of every 17004 service to prevent this workflow failure.

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📎 Sources

¹ AMA CPT 2025 Professional Edition — CPT 17004, Surgery: Integumentary System, Destruction-Premalignant Lesions · ² CMS 2025 Medicare Physician Fee Schedule Final Rule (CMS-1807-F) · ³ CMS RVU25A Relative Value Files — wRVU and global period data for CPT 17004 · ⁴ CMS Medicare RAC Guidance 0121 — Destruction of Premalignant Lesions: Excessive Units; CPT 17000/17003/17004 unit limits per date of service · ⁵ NCCI Policy Manual Chapter 4 (Surgery: Integumentary System), CMS 2025 — bundling rules between premalignant (17000-17004) and benign (17110-17111) destruction families; modifier -59 / XS guidance · ⁶ ICD-10-CM Official Guidelines for Coding and Reporting FY2026 — Chapter 12: Diseases of the Skin and Subcutaneous Tissue, L57 coding guidance · ⁷ ICD-10-PCS Official Guidelines for Coding and Reporting FY2026 — Root Operation Destruction (5), Body System H (Skin and Breast) · ⁸ Merrill et al., “The validity of diagnostic and treatment codes for actinic keratosis in administrative data,” JAMA Dermatology / PMC7266709, 2020 — validity of L57.0 and CPT 17000/17003/17004 for AK research and claims · ⁹ AAPC CPT Code 17004 Reference — aapc.com/codes/cpt-codes/17004 · ¹⁰ Auctus Group Consulting — “CPT 17004: When and How to Use It” (2025) · ¹¹ Palmetto GBA Jurisdiction M — Global Period and Modifier Policy (2024) · ¹² CGS Medicare — Bilateral Surgeries: Claim Submission Job Aid (2024)