Double-Charge Detector 01999

Unlisted anes procedure — 3 bundling rules

If your bill lists 01999 alongside any of these codes as separate charges, it may be an unbundling error.

By Michael Glenn , Healthcare Data Analyst · Published March 15, 2026 · Updated April 3, 2026

About the analyst

Michael Glenn reviews CMS datasets and drug pricing at BillRazor Research. He focuses on NADAC acquisition costs and procedure coding accuracy. Expertise: drug pricing, NADAC data, CPT coding.

NCCI edit data

3 code pairs

Updated 2026-04-03

Bundling rules — 01999

NCCI edits: these codes have billing restrictions when billed with 01999

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

Common unbundling errors — Evaluation/Management procedures

Unbundling occurs when medical providers bill separately for services that should be combined into a single charge according to National Correct Coding Initiative (NCCI) rules. In evaluation and management procedures, the most common unbundling patterns include billing basic office visit codes alongside routine procedures that are already included in the visit, such as vital signs monitoring or standard physical examinations. Another frequent error involves separately charging for brief consultations or follow-up discussions that are components of the primary E/M service. Additionally, providers sometimes incorrectly unbundle diagnostic interpretations or care coordination activities that are integral parts of the evaluation process. With 276 E/M codes subject to NCCI bundling restrictions, these errors create charges above the benchmark for patients who may be billed twice for what should constitute a single comprehensive service. Understanding these bundling rules helps identify potential differences between submitted claims and appropriate coding standards, ensuring patients receive accurate billing for their medical services.

What to check on your bill

When reviewing your medical bill for evaluation and management services, examine these key areas to identify potential bundling issues. First, check for duplicate charges by looking for multiple procedure codes on the same date that should typically be combined, such as separate charges for consultation, examination, and decision-making that occurred during one visit. Second, watch for code patterns where basic services appear alongside comprehensive codes—for example, a simple office visit code billed with a complete physical exam code for the same encounter. Third, verify that separately billed procedures include appropriate modifiers like "25" or "59," which indicate distinct services that justify separate billing. Fourth, compare charges above the benchmark for your area, as unbundled services often result in higher total costs than bundled alternatives. Review itemized statements carefully, as these billing practices can create potential differences in your final charges.

All bundling rules for 01999

3 code pairs that have billing restrictions with this procedure.

Never bill together

May bill with modifier

Code	Description	Rule
36591	Draw blood off venous device	Never bill together
36592	Collect blood from picc	Never bill together
96523	Irrig drug delivery device	Never bill together

FAQ — Evaluation/Management procedure bundling

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

NCCI (National Correct Coding Initiative) bundling means certain medical procedures and services should be billed together as one comprehensive code rather than separately. When services are 'bundled,' it indicates that one primary procedure code includes related or component services that cannot be billed individually on the same date of service.

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

Incorrect unbundling occurs when you see separate charges for services that should be included in a comprehensive E/M visit code, such as multiple office visit codes on the same date or add-on services billed separately when they're part of the primary evaluation. Review your itemized bill for multiple E/M codes on the same date or related diagnostic services that may fall under NCCI bundling restrictions.

What should I do if I find charges that appear to be incorrectly unbundled?

Contact your healthcare provider's billing department to request a detailed explanation of the separate charges and ask them to review the coding against NCCI guidelines. You can also request documentation showing why the services were billed separately and whether appropriate modifiers were used to justify the unbundling.

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

Modifiers are legitimate when services are performed at different anatomical sites, during separate patient encounters on the same day, or when procedures are truly distinct and independent from the primary service. The provider must document medical necessity and the distinct nature of the services to justify using modifiers like -25, -59, or -XS to override standard bundling rules.

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.