What Does CPT Code 00212 Mean?

CPT code 00212 describes anesthesia services provided for subdural tap procedures. A subdural tap is a neurosurgical procedure performed primarily in infants and young children to access the subdural space through an open cranial suture or fontanelle for diagnostic or therapeutic drainage.

Subdural taps are most commonly performed in the pediatric population, particularly in infants with open anterior fontanelles. The procedure involves inserting a needle through the fontanelle or a cranial suture into the subdural space to drain fluid, obtain specimens for culture and analysis, or relieve intracranial pressure. While relatively brief compared to open cranial procedures, subdural taps require careful anesthesia management to avoid complications such as brain injury, hemorrhage, or infection.

Key Code Attributes:

• Billable Status: Fully billable as a standalone anesthesia service
• Base Units (CMS 2026): 5
• Primary Setting: Hospital operating room, neonatal intensive care unit, or pediatric intensive care unit
• Provider Type: Anesthesiologist (MD/DO) or CRNA with physician supervision
• Service Category: General anesthesia (most common), monitored anesthesia care (MAC), or sedation
• Effective Status: Active CPT code with no planned retirement (verified through 2026)
• Typical Patient Population: Infants and young children with open fontanelles, typically under 18 months of age

What Services and Procedures Does CPT Code 00212 Cover?

CPT 00212 covers anesthesia for subdural tap procedures, which involve accessing the subdural space through a fontanelle or cranial suture for diagnostic or therapeutic purposes.

Covered Procedures and Surgical Indications:

• Subdural tap for drainage of subdural effusion
• Subdural tap for drainage of subdural empyema
• Subdural tap for diagnosis and treatment of subdural hematoma in infants
• Subdural tap for collection of cerebrospinal fluid for culture and analysis
• Bilateral subdural tap through anterior fontanelle
• Subdural tap through coronal suture or posterior fontanelle

What Does CPT Code 00212 Specifically Exclude?

CPT 00212 does not cover anesthesia for:

• Burr hole or twist drill craniostomy procedures (use 00210 or 00211)
• Craniotomy or craniectomy (use 00210 for simple, 00214-00220 for more complex)
• Stereotactic biopsy or deep brain stimulator placement (use 00210-00211)
• Procedures for spine or spinal cord (use 00600-00670)
• Ventriculoperitoneal shunt placement or revision (use 00220)

When Is CPT Code 00212 the Right Code to Use?

Use CPT 00212 when the surgical procedure is a subdural tap — needle aspiration of the subdural space through a fontanelle or cranial suture in an infant or young child.

Step-by-Step Code Selection:

1. Confirm the procedure is a needle aspiration of the subdural space
2. Verify the patient is an infant or young child with accessible fontanelles
3. Ensure the procedure is not a burr hole or twist drill craniostomy (these use 00210-00211)
4. Confirm the procedure is not a full craniotomy or craniectomy (these use 00210-00220)
5. Verify base units are 5 per the CMS Physician Fee Schedule

How Does CPT Code 00212 Differ From Other Cranial Anesthesia Codes?

| Code | Procedure | Typical Surgical Examples | Base Units | |---

---|-----------|--------------------------|------------| | 00210 | Burr hole(s) or twist drill | Burr hole for chronic subdural drainage, ICP monitor placement | 11 | | 00211 | Simple cranial biopsy | Stereotactic brain biopsy, endoscopic third ventriculostomy | 10 | | 00212 | Subdural tap | Subdural tap through fontanelle in infant | 5 | | 00214 | Burr holes with ventriculography | Burr holes for ventriculography or catheter placement | 9 | | 00215 | Cranioplasty | Elevation of depressed fracture, cranioplasty | 9 |

What Documentation Is Required to Support CPT 00212?

What Must the Provider Document?

Required Documentation Elements:

• ASA Physical Status Classification
• Preoperative neurologic assessment including signs of increased intracranial pressure
• Start and stop times
• Type and dosage of anesthetic agents
• Airway management technique
• Tolerance of procedure
• Fluid management, especially in neonates
• Temperature management in infants
• Postoperative neurologic assessment

Frequently Asked Questions About CPT Code 00212

What is the Average Payment for CPT 00212 in 2026?

Using the Medicare anesthesia conversion factor of $21.71 for 2026 and the CMS base unit of 5:

• 5 base units + time units + physical status modifier units + qualifying circumstances units = total units
• Total units x $21.71 = anesthesia payment
• For a 30-minute procedure with ASA 2E: 5 base + 1 time + 1 status = 7 total units x $21.71 = $151.97
• Commercial payer rates may be 2-5x higher depending on contract terms

Why is Subdural Tap Primarily a Pediatric Procedure?

The anterior fontanelle typically closes between 12-18 months of age. In infants, the open fontanelle provides a natural, non-bony window to access the intracranial space. Subdural taps exploit this anatomy to drain subdural collections without drilling through the skull. Beyond infancy, burr holes or twist drill craniostomy are required to access the subdural space, and those procedures use CPT codes 00210 or 00211.

Key Takeaways for Billing and Coding CPT 00212

• CPT 00212 covers anesthesia for subdural tap procedures in infants
• Base units are 5 under the 2026 CMS Physician Fee Schedule
• Distinct from burr hole codes 00210, 00211 and craniotomy codes 00214-00220
• Patient population is almost exclusively infants with open fontanelles
• Brief procedure but requires specialized pediatric anesthesia expertise

Common Coding Errors and Denials

Error 1: Using 00212 for Burr Hole Procedures If the surgeon drills through bone (burr hole or twist drill), the correct code is 00210 or 00211, not 00212. Error 2: Using 00212 for Older Children or Adults Subdural taps are anatomically possible only in patients with open fontanelles. For older patients, use 00210-00211. Error 3: Incorrect Base Unit Claims Some sources list 00212 as having 4 base units, but the CMS Physician Fee Schedule confirms 5 base units for 2026.

Additional Resources and References

• CMS Physician Fee Schedule: Official source for base units, conversion factors, and reimbursement data
• ASA Relative Value Guide: The American Society of Anesthesiologists annual RVG
• AMA CPT Professional Edition: The official CPT code set from the American Medical Association