Medical Billing Guide

CPT Code 00404 for Anes integ sys rad/modf brst

Written by Laim Will
Denial Journal Editors
📅 Updated: September 2026
⏱️ 4 min read
🛡️
Medically & Regulatory Audited: Reviewed against active CMS Guidelines and official AMA standards.

Understanding CPT Code 00404: Anesthesia for Procedures on the Integumentary System Involving the Breast

The Current Procedural Terminology (CPT) code 00404 is a specific code used to describe anesthesia services provided during procedures on the integumentary system involving the breast, particularly for radical or modified radical mastectomies. This code is crucial for healthcare professionals, particularly those in anesthesia and billing, to accurately document and bill for services rendered.

What is CPT Code 00404?

CPT code 00404 is designated for anesthesia services related to surgical interventions on the integumentary system when they involve the breast. This often includes surgeries such as radical or modified radical mastectomies, which are performed to treat or prevent breast cancer. The code ensures that anesthesia providers are reimbursed for their critical role in patient care during these complex procedures.

The Importance of Accurate CPT Coding

Accurate coding, including the use of CPT Code 00400, is essential for several reasons:

  • Reimbursement: Proper coding ensures that healthcare providers are reimbursed correctly by insurance companies for the services they provide.
  • Compliance: Adhering to coding standards helps avoid legal and financial penalties associated with incorrect billing.
  • Data Collection: Accurate coding contributes to the collection of healthcare data used for research, policy-making, and improving patient outcomes.

Procedures Associated with CPT Code 00404

The primary procedures associated with CPT code 00404 include those covered under CPT Code 00410:

  1. Radical Mastectomy: This surgery involves the removal of the breast, underlying chest muscle, and lymph nodes of the axilla as a treatment for breast cancer.
  2. Modified Radical Mastectomy: Similar to a radical mastectomy, this procedure involves the removal of the breast and lymph nodes but spares the chest muscles, reducing recovery time and preserving more physical function.

Billing and Documentation for CPT Code 00404

When billing for anesthesia services under CPT code 00404, it’s important to ensure that the documentation is comprehensive and includes:

  • Patient Identification: Full details of the patient receiving the procedure.
  • Procedure Details: Specifics about the surgery performed, including the type of mastectomy and the extent of tissue removal.
  • Anesthesia Time: Documenting the start and end times of anesthesia services to support billing for time-based services.
  • Anesthesiologist’s Notes: Detailed notes on the anesthesia provided, including drugs used, dosages, and any complications or notable events during the procedure.

Challenges in Coding and Billing for Anesthesia

Coding and billing for anesthesia services can be challenging due to several factors:

  • Complex Code Selection: Choosing the correct CPT code requires a deep understanding of the procedures and anesthesia services involved.
  • Time-Based Billing: Anesthesia billing often involves calculating time units, which requires precise documentation and understanding of billing increments.
  • Insurance Variability: Different insurance providers may have varying requirements for documentation and reimbursement, necessitating thorough knowledge of payer-specific guidelines.

Best Practices for Using CPT Code 00404

To ensure accuracy and compliance when using CPT code 00404, consider the following best practices:

  1. Continuous Education: Stay updated on changes to CPT codes and billing guidelines through regular training and professional development.
  2. Detailed Documentation: Ensure that all aspects of the anesthesia service are documented meticulously to support claims and avoid disputes.
  3. Utilize Technology: Leverage billing software and electronic health records to streamline documentation and coding processes.
  4. Collaboration with Billing Professionals: Work closely with billing specialists to ensure that all coding and billing practices are compliant and accurate.

Conclusion

CPT code 00404 plays a vital role in the healthcare billing process for anesthesia services related to breast surgeries. Understanding and accurately applying this code is essential for industry professionals to ensure proper reimbursement, maintain compliance, and contribute to the efficient operation of healthcare services. By following best practices and staying informed about coding updates, anesthesia providers can effectively manage the complexities of billing for these critical services.

Laim Will

Lead Revenue Cycle & Compliance Analyst

Specializing in medical billing workflows, claim denial resolutions, and CMS coding compliance.