CPT 00100
CPT code 00100 is used to report anesthesia services provided during procedures involving the salivary glands, including biopsy. This guide covers documentation, reimbursement, coding considerations, ICD-10-CM diagnoses, and related anesthesia codes.
Code Description
CPT code 00100 is used for anesthesia services provided during procedures involving the salivary glands, including biopsy. Salivary gland procedures may involve the parotid, submandibular, sublingual, or other salivary glands.
The anesthesia provider evaluates the patient before the procedure, develops the anesthesia plan, administers anesthesia, continuously monitors the patient's physiologic status, and manages the patient throughout the anesthesia service.
Code selection should be based on the surgical or diagnostic procedure performed. A salivary gland diagnosis alone does not establish that CPT code 00100 is appropriate.
When to Use CPT 00100
Use CPT code 00100 when anesthesia is provided for a qualifying procedure involving a salivary gland.
Common examples may include:
Salivary gland biopsy
Parotid gland procedures
Submandibular gland procedures
Procedures involving salivary gland tumors or masses
Other qualifying surgical procedures involving a salivary gland
The operative report should clearly identify the anatomical site and procedure performed. The anesthesia record should support the anesthesia service, monitoring, and reported anesthesia time.
When NOT to Use CPT Code 00100
Do not report CPT code 00100 when:
The procedure does not involve a salivary gland.
Another anesthesia CPT code more accurately describes the procedure performed.
The patient has a salivary gland diagnosis but no qualifying salivary gland procedure is performed.
The service represents sedation or another service that should be reported under different coding rules.
Documentation does not support the procedure associated with the anesthesia service.
Review the operative report rather than selecting the anesthesia code solely from the patient's diagnosis.
Documentation Requirements
Documentation should clearly support the anesthesia service and include:
Procedure requiring anesthesia
Anatomical site of the procedure
Pre-anesthesia evaluation
Anesthesia plan
Medications and agents administered
Physiologic monitoring
Anesthesia start and stop times
Patient response to anesthesia
ASA physical status when applicable
Post-anesthesia evaluation and transfer of care
The operative documentation should establish that the procedure involves a salivary gland. The anesthesia record should separately support the anesthesia professional's work throughout the service.
When reimbursement is based partly on anesthesia time, start and stop times should be documented according to applicable payer requirements.
Documentation Checklist
Before submitting CPT code 00100, confirm that the medical record includes:
✓ Salivary gland procedure documented
✓ Anatomical site identified
✓ Medical necessity supported
✓ Pre-anesthesia evaluation completed
✓ Anesthesia plan documented
✓ Anesthesia start and stop times recorded
✓ Physiologic monitoring documented
✓ ASA physical status documented when applicable
✓ Post-anesthesia care documented
Examples
Example 1
A patient with a parotid gland mass undergoes a surgical procedure requiring anesthesia. The anesthesia provider performs a pre-anesthesia evaluation, administers anesthesia, continuously monitors the patient, and documents anesthesia time. CPT code 00100 may be reported for the anesthesia service.
Example 2
A patient undergoes a salivary gland biopsy for evaluation of a suspicious gland lesion. An anesthesia professional provides anesthesia throughout the procedure and maintains a complete anesthesia record. CPT code 00100 is reported for the anesthesia service.
Example 3
A patient with a documented submandibular gland disorder undergoes a qualifying surgical procedure on the gland. The anesthesia provider documents the pre-anesthesia assessment, anesthesia administration, monitoring, start and stop times, and postoperative transfer of care. CPT code 00100 may be appropriate.
Base Units & Reimbursement
Anesthesia reimbursement is generally calculated differently from reimbursement for most surgical and E/M services. Payment commonly considers the anesthesia code's base units, documented anesthesia time, and the applicable payer conversion factor.
The basic payment methodology generally considers:
Base Units + Time Units + Applicable Additional Units
The resulting units are then multiplied by the applicable anesthesia conversion factor. Exact reimbursement depends on the payer, geographic area, provider type, and other applicable payment policies.
Anesthesia time should be documented carefully because it can directly affect reimbursement. Medicare and commercial insurers may also have different requirements for reporting provider involvement, medical direction, physical status, and qualifying circumstances.
Coding & Billing Tips
Verify that the operative report identifies a procedure involving a salivary gland.
Select the anesthesia code based on the procedure performed rather than the diagnosis alone.
Document anesthesia start and stop times accurately.
Ensure the ICD-10-CM diagnosis reflects the condition being treated or evaluated.
Document the anesthesia provider's involvement and services completely.
Report physical status and other anesthesia modifiers when required by the payer.
Review payer-specific anesthesia time and reimbursement requirements before submitting the claim.
Common Billing Mistakes
Using 00100 for any head or neck procedure
CPT code 00100 is specific to anesthesia for qualifying salivary gland procedures. Other procedures involving the head or neck may require a different anesthesia code.
Coding from the diagnosis alone
A diagnosis involving the parotid or another salivary gland does not automatically support CPT 00100. The actual procedure performed must fall within the scope of the anesthesia code.
Reporting inaccurate anesthesia time
Incorrect start or stop times can affect anesthesia time units and reimbursement. The anesthesia record should clearly support the time reported on the claim.
Incomplete anesthesia documentation
Missing information about monitoring, medications, anesthesia management, or postoperative care may make it difficult to support the billed anesthesia service.
Using surgical procedure time as anesthesia time
Anesthesia time is not automatically identical to surgical time. Report anesthesia time according to applicable anesthesia billing rules.
Missing the anatomical site
The medical record should clearly identify that the procedure involves a salivary gland and specify the site when known.
Common ICD-10-CM Codes
D11.0 – Benign Neoplasm of Parotid Gland
May support medical necessity when a patient undergoes biopsy or surgical treatment of a documented benign parotid gland neoplasm.
K11.20 – Sialoadenitis, Unspecified
May be reported when inflammation of a salivary gland requires a diagnostic or surgical procedure performed under anesthesia.
C07 – Malignant Neoplasm of Parotid Gland
May support medical necessity when anesthesia is provided during biopsy or surgical treatment of a malignant parotid gland neoplasm.
K11.5 – Sialolithiasis
May apply when a patient undergoes a procedure for a salivary gland or duct stone and the documented procedure supports CPT 00100.
K11.8 – Other Diseases of Salivary Glands
May be appropriate when another documented salivary gland disorder requires a qualifying procedure and a more specific diagnosis code is not applicable.
Applicable Modifiers
Modifier AA identifies anesthesia services personally performed by an anesthesiologist. Report the modifier when it accurately reflects provider involvement and is required by the payer.
Modifier QX may be used for CRNA services performed with medical direction by a physician. Documentation must support applicable medical-direction requirements.
Modifier QZ may be used for CRNA anesthesia services performed without medical direction by a physician when appropriate under applicable billing and payer requirements.
Related CPT Codes
CPT 00102 applies to anesthesia for plastic repair of cleft lip. It represents a different procedure within the anesthesia code range for procedures involving the head.
CPT 00103 applies to anesthesia for qualifying reconstructive eyelid procedures. Review the actual surgical procedure and anatomical site when distinguishing it from CPT 00100.
CPT 00104 describes anesthesia for electroconvulsive therapy rather than anesthesia associated with a salivary gland procedure.
FAQ
What is CPT code 00100 used for?
CPT code 00100 is used to report anesthesia services provided for procedures involving the salivary glands, including biopsy.
Can CPT 00100 be used for a parotid gland procedure?
Yes. Because the parotid is a salivary gland, CPT 00100 may be appropriate when anesthesia is provided for a qualifying procedure involving the parotid gland.
Is CPT 00100 limited to salivary gland biopsies?
No. Biopsy is included within the code description, but CPT 00100 may also apply to other qualifying procedures involving the salivary glands.
How is CPT 00100 reimbursement calculated?
Anesthesia reimbursement generally considers base units, documented anesthesia time, the applicable conversion factor, and payer-specific payment adjustments.
Does CPT 00100 require anesthesia time documentation?
Anesthesia start and stop times should be documented accurately because anesthesia time is commonly used when calculating reimbursement.
Which modifiers can be reported with CPT 00100?
The appropriate anesthesia modifier depends on how the anesthesia service was provided. Examples include AA for services personally performed by an anesthesiologist and QX or QZ for qualifying CRNA services. Payer requirements should be verified before billing.
Category
CPT
Typical Time
Hospital & Ambulatory Surgery Center
Base units assigned by payer
Description
Code Type
Code
00100
Anesthesia for salivary gland procedures
Anesthesia
Common Setting
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