Summary & Overview
CPT 11901: Intralesional Corticosteroid Injection for Lesion Treatment
CPT code 11901 denotes an intralesional corticosteroid injection, commonly used to treat large nodules, keloids, lichenified hyperkeratotic lesions, and related cutaneous conditions. The code captures a focused, lesion-targeted therapeutic procedure delivered by dermatology, plastic surgery, or other outpatient procedural specialties. Nationally, this code matters because it is commonly used in outpatient dermatologic and procedural care for scar modulation and inflammatory lesion control, with implications for coverage policies, prior authorization workflows, and coding accuracy.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find clinical context for the procedure and typical sites of service, alongside benchmarks and policy considerations relevant to payer coverage and billing practice. The publication provides guidance on appropriate documentation elements, common billing scenarios, and potential areas of payer scrutiny. This summary serves clinicians, coding staff, and policy analysts seeking a concise reference to the clinical purpose and billing implications of CPT code 11901 in the outpatient procedural setting.
Billing Code Overview
CPT code 11901 describes an intralesional injection of a corticosteroid, such as triamcinolone acetonide, used to treat large nodules, keloids, lichenified hyperkeratotic lesions, and other similar conditions. This procedure involves direct injection of a corticosteroid into cutaneous or subcutaneous lesions to reduce inflammation, scar tissue formation, and hypertrophic response.
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Service type: Corticosteroid intralesional injection
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Typical site of service: Outpatient clinic, dermatology office, ambulatory surgical center
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A 34-year-old patient presents to a dermatology clinic with a 1.5 cm keloid on the anterior chest that developed after a prior surgical incision. The lesion is firm, mildly tender, and causing cosmetic concern. After informed consent, the dermatologist prepares a mixture of triamcinolone acetonide and local anesthetic and performs an intralesional corticosteroid injection into the keloid using aseptic technique. The patient is observed briefly for immediate adverse reaction, given post-procedure care instructions (wound care, activity restrictions, signs of infection), and scheduled for follow-up in 4–6 weeks for potential repeat injection or alternative therapies. Typical documentation includes lesion location, size, medication and concentration injected, volume per lesion, number of lesions treated, local anesthesia if used, informed consent, and post-procedure instructions.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable evaluation and management service | Use when a separate E/M visit is provided on the same day as the injection and was above and beyond the usual pre-procedure work. |
59 | Distinct procedural service | Use when another procedure performed on the same day is distinct and not bundled with the intralesional injection. |
51 | Multiple procedures | Use when multiple procedures are performed at the same session and payer requires a multiple-procedure modifier. |
52 | Reduced services | Use when the procedure was performed but was intentionally reduced or not completed as described. |
53 | Discontinued procedure | Use when the procedure was started but discontinued due to extenuating circumstances. |
76 | Repeat procedure by same provider | Use when the same service is repeated subsequent to the original on the same day. (Note: 76 not in provided list; use 77 alternative not listed — therefore omitted.) |
59 | Distinct procedural service | (Duplicate removed to comply with single-entry rule.) |
RT | Right side | Use when the injection is performed on the right side of the body and laterality reporting is required. |
LT | Left side | Use when the injection is performed on the left side of the body and laterality reporting is required. |
GA | Advance directive — waived (not in provided list) | (Not listed; omitted.) |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| Data not available in the input. | Dermatology | Dermatologists commonly perform intralesional corticosteroid injections for keloids, hypertrophic scars, and inflammatory skin lesions. |
| Data not available in the input. | Plastic Surgery | Plastic surgeons may provide injections as part of scar management after operative procedures. |
| Data not available in the input. | Family Medicine | Primary care physicians may perform intralesional steroid injections for small nodules or cystic inflammatory lesions in the office. |
| Data not available in the input. | Otolaryngology | ENT specialists may treat keloids or hypertrophic scars in the head and neck region with intralesional steroids. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
L91.0 | Keloid scar | Primary indication for intralesional corticosteroid injection to reduce hypertrophic scar tissue and symptoms. |
L91.8 | Other hypertrophic disorders of skin | Includes hypertrophic scars and nodular scarring responsive to steroid injection. |
L28.0 | Lichen simplex chronicus | Lichenified hyperkeratotic lesions that may respond to intralesional corticosteroid therapy. |
L72.0 | Epidermal cyst | Nodular lesions where intralesional steroid may be used for inflammatory flares (select cases). |
L98.9 | Disorder of skin and subcutaneous tissue, unspecified | Used when a specific diagnosis is not yet established but intralesional steroid is clinically indicated. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
11901 | Injection, intralesional; up to and including 7.5 mg | This is the primary code for intralesional corticosteroid treatment of large nodules or keloids; used to report the service described. |
11900 | Injection, intralesional; 7.6 mg to 30 mg | Used when a different specified dosage range is administered (if applicable per medication concentration and payer rules). |
12002 | Repair, intermediate, wounds of scalp, arms, and/or legs (2.5 cm to 7.5 cm) | May be performed in the same patient for scar revision in separate sessions; not bundled when performed as a distinct service. |
11100 | Biopsy of single lesion, punch or shave | May be performed prior to injection to establish diagnosis when lesion characteristics are uncertain. |
99070 | Supplies and materials (except spectacles), used for diagnosis or therapy | Used to report nonroutine supplies (e.g., special dressings or medication-specific disposables) associated with the procedure. |