Unlisted CPT code examples

Unlisted CPT codes are non-specific codes used as a last resort when no existing CPT or HCPCS Level II code accurately describes the procedure, service, or technology you provided. They act as placeholders for services that are too new, rare, or unusual to have their own permanent code.

Why Would I Use Them?

You use an unlisted code to maintain coding accuracy and avoid fraud. Selecting a specific code that is “close enough” but not accurate is considered a misrepresentation of services.

• New Technology/Procedures: Medical innovation often outpaces the annual CPT updates. If you are using a brand-new device or surgical technique that hasn’t been assigned a code yet, you must use an unlisted code.
• Rare/Unusual Services: Some procedures are so rare that the AMA has not created a specific code for them.
• Variable Services: Some services are highly variable in their extent and nature, making it difficult to define a standard code.

What You Need to Know When Using Them

Because unlisted codes (often ending in “99”) have no established value or description, using them requires extra effort to get paid:

• Manual Review Required: These claims cannot be processed automatically. A human payer must review them, which delays payment.
• Documentation is Mandatory: You must submit a “Special Report” or operative note that explains:
  • Definition: A clear description of the nature, extent, and need for the procedure.
  • Time/Effort: How long it took and the complexity involved.
  • Equipment: Any special equipment used.
• Benchmarking: To help the payer determine a price, you should compare the unlisted procedure to a similar, existing CPT code (a “crosswalk” or “comparison code”). Explain how your service compares in terms of work, time, and difficulty (e.g., “This procedure was similar to code X but required 20% more time due to…”).

Common Unlisted Code Examples:

• 30999 - Unlisted procedure, nose
• 69399 - Unlisted procedure, external ear
• 29999 - Unlisted procedure, arthroscopy

Unlisted codes almost always end in “99” (or sometimes “89”). They are categorized by body system or section in the CPT book.

Here are more examples broken down by specialty to help you recognize them:

Surgery / Musculoskeletal

• 20999 - Unlisted procedure, musculoskeletal system, general
  • Scenario: A surgeon performs a novel tendon transfer technique that isn’t described by any existing orthopedic code.
• 22899 - Unlisted procedure, spine
  • Scenario: Used for a new type of minimally invasive spinal implant that doesn’t fit the descriptors for current instrumentation codes.
• 27599 - Unlisted procedure, femur or knee
  • Scenario: You might use this for a complex revision of a knee surgery that utilizes a brand-new experimental approach.

Digestive System

• 43289 - Unlisted laparoscopy procedure, esophagus
  • Scenario: A doctor performs a laparoscopic repair of the esophagus using a method that doesn’t match the specific “Nissen fundoplication” or hernia repair codes.
• 44799 - Unlisted procedure, intestine
  • Scenario: Used for rare intestinal surgeries, such as extensive distinct rerouting of the small bowel not covered by standard resection/anastomosis codes.
• 47399 - Unlisted procedure, liver
  • Scenario: Sometimes used for new types of liver tumor ablation technologies that don’t match existing radiofrequency or cryoablation codes.

Cardiovascular & Respiratory

• 33999 - Unlisted procedure, cardiac surgery
  • Scenario: A cardiac surgeon performs a hybrid procedure involving both open heart surgery and a catheter-based intervention that has no combined code.
• 31299 - Unlisted procedure, accessory sinuses
  • Scenario: Often used by ENTs for sinus surgeries using novel tools (like certain drug-eluting stents) if no specific “placement of stent” code exists for that sinus.

Radiology

• 76499 - Unlisted diagnostic radiographic procedure
  • Scenario: Used for an X-ray study that uses a non-standard view or technique required for a rare deformity.
• 76999 - Unlisted ultrasound procedure
  • Scenario: Could be used for a specialized ultrasound examination (e.g., of a specific foreign body) not covered by organ-specific ultrasound codes.

Pathology & Laboratory

• 81599 - Unlisted multianalyte assay with algorithmic analysis
  • Scenario: Frequently used for new “gene expression profile” tests (cancer classifiers) that are proprietary and haven’t been assigned a specific CPT or PLA code yet.
• 84999 - Unlisted chemistry procedure
  • Scenario: Used for a lab test measuring a rare substance in the blood for which no specific analyte code exists.

Medicine & Vaccines

• 90749 - Unlisted vaccine/toxoid
  • Scenario: Used when a new vaccine is FDA-approved but the CPT code hasn’t been updated to include it yet (common during early release of new vaccines).
• 99199 - Unlisted special service, procedure, or report
  • Scenario: A “catch-all” for general medical services that don’t fit anywhere else, often used for administrative or special reporting services required by a payer.

Quick Tip for Usage

When you use any of these, remember the “Equivalent Code” rule:
On your claim or in your notes, tell the insurance company: “This unlisted procedure (Code X) was performed. It required similar skill, time, and resources to Code Y (The Comparison Code), but differed in the following way…” This gives them a price anchor.

Specifically for my specialties:

Based on the provided sources, you should use unlisted procedure codes in Otolaryngology, Ophthalmology, and urology when a specific CPT or HCPCS code that accurately describes the service performed does not exist. It is inappropriate to report the “best fit” code that merely approximates the service; if the specific procedure is not listed, the unlisted code must be used.

Here are specific scenarios and guidelines for these specialties:

Otolaryngology (ENT)

• Turbinate Excision: Use unlisted code 30999 (Unlisted procedure, nose) when performing excisions of the superior or middle turbinates. The specific CPT code 30130 (Excision inferior turbinate, partial or complete) is strictly for the inferior turbinate.
• Sinus Surgery with Novel Tools: Use unlisted code 31299 (Unlisted procedure, accessory sinuses) for sinus surgeries utilizing novel technologies, such as certain drug-eluting stents, if no specific code exists for the placement of that stent in that sinus.
• External Ear Procedures: Use code 69399 (Unlisted procedure, external ear) for rare or unusual procedures on the external ear that do not have a defined code.
• Lacrimal System: Use code 68899 (Unlisted procedure, lacrimal system) for procedures on the lacrimal system not described by other codes.

Ophthalmology

• Anterior Segment Procedures: Use code 66999 (Unlisted procedure, anterior segment of eye) for procedures performed on the anterior segment of the eye that do not have a specific code.
• General Services: Use code 92499 (Unlisted ophthalmological service or procedure) for general ophthalmological services or procedures not listed elsewhere.
• Visual Fields: Use unlisted codes if an examination method does not fit the defined visual field examination codes (92081-92083).

Urology

• Laparoscopic Ureter Procedures: Use code 50949 (Unlisted laparoscopy procedure, ureter) for laparoscopic procedures on the ureter that lack a specific code.
• Male Genital Procedures: Use code 55899 (Unlisted procedure, male genital system) for procedures on the male genital system not described by existing codes.
• Kidney Procedures: Use code 53899 (Unlisted procedure, urinary system) or other specific unlisted codes like 50549 (Unlisted laparoscopy procedure, renal) if the specific laparoscopic renal procedure is not defined.

General Rules for Using Unlisted Codes

• New Technology: Use unlisted codes for brand-new devices or surgical techniques that have not yet been assigned a permanent Category I or Category III code.
• Documentation Requirements: When submitting an unlisted code, you must typically provide a “Special Report” or operative note. This documentation should include:
  • A clear definition of the nature, extent, and need for the procedure.
  • The time, effort, and complexity involved.
  • Any special equipment used.
• Benchmarking: To assist payers in determining reimbursement, you should compare the unlisted procedure to a similar, existing CPT code (a “crosswalk” code) and explain how the unlisted service compares in terms of work, time, and difficulty.
• NCCI Edits: Generally, the National Correct Coding Initiative (NCCI) does not include edits for unlisted codes because they cover a diverse group of services.