Mastering 2026’s New CT Cerebral Perfusion Codes: 70472 and 70473

In the 2026 CPT update, Category III code 0042T for cerebral perfusion analysis has been deleted and replaced by two new Category I codes: 70472 and 70473. These codes support critical applications like acute stroke evaluation, occlusive carotid disease assessment, post-aneurysm vasospasm detection, brain tumor grading, stereotactic biopsy guidance, and treatment response monitoring.

Perfusion analysis typically follows a routine head CT (e.g., non-contrast acquisition), with a separate contrast-enhanced scan for dynamic imaging and postprocessing.

Key Code Definitions

• 70472: Computed tomographic (CT) cerebral perfusion analysis with contrast material(s), including postprocessing, performed with concurrent CT or CT angiography (CTA) of the same anatomy.
  This is an add-on code—report separately in addition to the primary procedure code.

• 70473: Computed tomographic (CT) cerebral perfusion analysis with contrast material(s), including postprocessing, performed without concurrent CT or CTA of the same anatomy.
  Standalone code; do not report with concurrent CT/CTA codes.

Reporting Rules

• Use 70472 only with same-session CT/CTA codes for the head: 70450, 70460, 70470, 70471, or 70496.

• Never report 70472 with 70473, 76376 (3D rendering), or 76377 (3D modeling).

• Never report 70473 with 70450, 70460, 70470, 70471, 70472, 70496, 76376, or 76377.

These updates enhance specificity and reimbursement accuracy—review documentation for concurrency to select the right code.

Building on the core 70472 and 70473 codes, this expanded guide covers billing modifiers, key NCCI edits, and real-world clinical examples. Use it to ensure compliant, optimized reimbursement for cerebral perfusion studies.

Billing Modifiers

Apply these modifiers based on procedure details:

• -26 (Professional Component): Report when interpreting perfusion analysis without technical components (e.g., hospital-employed radiologist reviewing images).

• –TC (Technical Component): For facility-performed imaging and postprocessing only.

• -59 (Distinct Procedural Service) or XU/XE/XS/XP (X modifiers): If perfusion analysis is distinct from bundled imaging—rare, as 70472 bundles with primary codes; document medical necessity.

• -LT/RT: For unilateral studies (e.g., left/right hemisphere focus), though bilateral is typical.

• Global (no modifier): Full professional + technical service by same provider.

Tip: Always verify payer policies; Medicare requires modifier -26 for TC-furnished by facility.

MUST BUY ICD-10 CM  CODING EBOOKS 

NCCI Edits (PTP Pairs)

NCCI prevents unbundling. Key edits for 2026 (Column 1 codes listed first; check CMS PTP tool for modifiers):

• 70472 not with 70473 (0 indicator—mutually exclusive).

• 70472/70473 not with 76376/76377 (0 indicator—postprocessing bundled).

• 70472 bundles with 70450/70460/70470/70471/70496 (0 indicator; add-on exempt).

• 70473 not with head CT/CTA codes above (1 indicator—use -59/X modifier only if distinct anatomies/sessions, with strong documentation).

• No edits with 70540–70553 (MRI perfusion); report separately if both performed.

Query the latest NCCI quarterly updates via CMS for payer-specific overrides.

Clinical Scenario Examples

These illustrate code selection with modifiers and rationale:

Pro Tip: Document “separate acquisition for perfusion with postprocessing” explicitly. Audit charts for concurrency to dodge denials.

This equips you for audits and appeals—stay current with AMA CPT and CMS updates.