Double-Charge Detector 0643T

Tcat l ventr rstrj dev implt — 366 bundling rules

If your bill lists 0643T alongside any of these codes as separate charges, it may be an unbundling error.

By Priya Iyengar , Senior Billing Analyst · Published March 15, 2026 · Updated April 3, 2026

About the analyst

Priya Iyengar leads the billing code review team at BillRazor Research. She analyzes NCCI bundling edits, DRG coding, and regional rate variation. Expertise: NCCI bundling, DRG analysis, regional pricing.

NCCI edit data

366 code pairs

Updated 2026-04-03

Bundling rules — 0643T

NCCI edits: these codes have billing restrictions when billed with 0643T

Research suggests 49–80% of hospital bills contain errors. Our system checks every line item against Medicare benchmarks.

Common unbundling errors — Other procedures

Unbundling occurs when medical providers bill two separate codes for services that should be combined into a single charge according to National Correct Coding Initiative (NCCI) rules. In other procedures including anesthesia, radiology, pathology, and miscellaneous support services, common unbundling patterns include separately billing diagnostic imaging with its professional interpretation when both should be included in one comprehensive code, and charging for basic monitoring or preparation services alongside the primary procedure when these components are considered integral parts of the main service. Another frequent error involves billing multiple pathology examination codes for what constitutes a single comprehensive analysis. With 809 other codes subject to bundling restrictions in the NCCI database, these errors create charges above the benchmark for patients who receive multiple bills for what should constitute one complete service. The potential difference between unbundled billing and correct coding practices can significantly impact patient financial responsibility, as they may face duplicate charges for components of care that medical coding standards define as a single billable service.

What to check on your bill

When reviewing itemized bills for procedure bundling issues, patients should examine several key areas to identify potential billing irregularities. Look for multiple procedure codes billed on the same date that represent components of a comprehensive service, such as separate charges for incision, repair, and closure when these steps are typically included in one primary procedure code. Watch for code patterns where related procedures share the same first three digits, as these often indicate services that should be bundled together under Medicare's Correct Coding Initiative. Check for appropriate modifier usage, particularly modifier 59 or XS, which legitimately allow separate billing when procedures are performed on different anatomical sites or during distinct sessions. Without proper modifiers, separately billed related procedures may represent charges above the benchmark. Compare your itemized statement against standard bundling practices for your specific procedure type to identify potential differences in billing patterns.

All bundling rules for 0643T

366 code pairs that have billing restrictions with this procedure.

Never bill together

271

May bill with modifier

Code	Description	Rule
01920	Anesth catheterize heart	Never bill together
01924	Anes ther interven rad artrl	Never bill together
01926	Anes tx interv rad hrt/cran	Never bill together
0213T	Njx paravert w/us cer/thor	Never bill together
0216T	Njx paravert w/us lumb/sac	Never bill together
0345T	Transcath mtral vlve repair	Never bill together
0483T	Tmvi percutaneous approach	Never bill together
0596T	Temp fml iu vlv-pmp 1st insj	May bill with modifier
0597T	Temp fml iu valve-pmp rplcmt	May bill with modifier
0632T	Perq tcat us abltj nrv p-art	Never bill together
0903T	Ecg alg 12 lead reduced i&r	May bill with modifier
0904T	Ecg alg 12 ld rdcd trcg only	May bill with modifier
0905T	Ecg alg 12 ld rdcd i&r only	May bill with modifier
11000	Dbrdmt ecz/infected skin<10%	May bill with modifier
11001	Dbrdmt ecz/infct skn ea addl	May bill with modifier
11004	Dbrdmt skin xtrnl gent&per	May bill with modifier
11005	Dbrdmt skin abdominal wall	May bill with modifier
11006	Dbrdmt skin xtrnl gent per	May bill with modifier
11042	Dbrdmt subq tis 1st 20sqcm/<	May bill with modifier
11043	Dbrdmt musc&/fsca 1st 20/<	May bill with modifier
11044	Dbrdmt bone 1st 20 sq cm/<	May bill with modifier
11045	Dbrdmt subq tiss each addl	May bill with modifier
11046	Dbrdmt musc&/fsca ea addl	May bill with modifier
11047	Dbrdmt bone each addl	May bill with modifier
12001	Rpr s/n/ax/gen/trnk 2.5cm/<	May bill with modifier
12002	Rpr s/n/ax/gen/trnk2.6-7.5cm	May bill with modifier
12004	Rpr s/n/ax/gen/trk7.6-12.5cm	May bill with modifier
12005	Rpr s/n/a/gen/trk12.6-20.0cm	May bill with modifier
12006	Rpr s/n/a/gen/trk20.1-30.0cm	May bill with modifier
12007	Rpr s/n/ax/gen/trnk >30.0 cm	May bill with modifier
12011	Rpr f/e/e/n/l/m 2.5 cm/<	May bill with modifier
12013	Rpr f/e/e/n/l/m 2.6-5.0 cm	May bill with modifier
12014	Rpr f/e/e/n/l/m 5.1-7.5 cm	May bill with modifier
12015	Rpr f/e/e/n/l/m 7.6-12.5 cm	May bill with modifier
12016	Rpr fe/e/en/l/m 12.6-20.0 cm	May bill with modifier
12017	Rpr fe/e/en/l/m 20.1-30.0 cm	May bill with modifier
12018	Rpr f/e/e/n/l/m >30.0 cm	May bill with modifier
12020	Tx supfc wnd dehsn smpl clsr	May bill with modifier
12021	Tx supfc wnd dehsn w/packing	May bill with modifier
12031	Intmd rpr s/a/t/ext 2.5 cm/<	May bill with modifier
12032	Intmd rpr s/a/t/ext 2.6-7.5	May bill with modifier
12034	Intmd rpr s/tr/ext 7.6-12.5	May bill with modifier
12035	Intmd rpr s/a/t/ext 12.6-20	May bill with modifier
12036	Intmd rpr s/a/t/ext 20.1-30	May bill with modifier
12037	Intmd rpr s/tr/ext >30.0 cm	May bill with modifier
12041	Intmd rpr n-hf/genit 2.5cm/<	May bill with modifier
12042	Intmd rpr n-hf/genit2.6-7.5	May bill with modifier
12044	Intmd rpr n-hf/genit7.6-12.5	May bill with modifier
12045	Intmd rpr n-hf/genit12.6-20	May bill with modifier
12046	Intmd rpr n-hf/genit20.1-30	May bill with modifier

Showing 50 of 366 rules. Show all

FAQ — Other procedure bundling

What is NCCI bundling and what does 'bundled' mean on a medical bill?

NCCI bundling refers to the National Correct Coding Initiative rules that prevent certain procedure codes from being billed separately when performed together. When codes are bundled, one procedure is considered inclusive of another, meaning only the primary procedure should be billed rather than charging for each component separately.

How can I identify if codes were incorrectly unbundled on my bill?

Incorrectly unbundled codes appear as separate line items on your bill when NCCI rules indicate they should be grouped together under one primary procedure code. This typically occurs with anesthesia, radiology, pathology, and miscellaneous support services that are considered integral to the main procedure being performed.

What should I do if I find unbundled charges on my medical bill?

Contact your healthcare provider's billing department to request a review of the charges and provide documentation showing the NCCI bundling rules that apply. Request an itemized explanation of why the codes were billed separately and ask for a corrected bill that reflects proper bundling if no valid modifier justification exists.

When is it legitimate to use modifiers to override NCCI bundling rules?

Modifiers are appropriately used when procedures are performed on different anatomical sites, during separate patient encounters, or when distinct procedural services are provided that don't fall under the bundling restrictions. The modifier usage must be supported by clear documentation in the medical record that demonstrates the services were truly separate and distinct from the bundled procedure.

Rates shown are from the 2026 Medicare Physician Fee Schedule and CMS IPPS. BillRazor compares your bill against these data sources. See how it works →

Data source: CMS National Correct Coding Initiative (NCCI) Procedure-to-Procedure (PTP) edits, updated quarterly. These code pairs are maintained by CMS to prevent improper billing of services that should be billed as a single procedure.

What this means: When two codes are listed as an NCCI edit pair, billing them separately on the same date of service is typically incorrect. "Never bill together" means no modifier can override the rule. "May bill with modifier" means the codes can be billed separately with appropriate documentation.