• Home
• Publications
  • CodeMap Premier Package
  • CodeMap Standard Package
  • Lab Reimbursement Manual
  • Lab Medical Necessity Guide
  • Lab CCI Manual
• Data Files
  • ICD-10 Medical Necessity
    • Hospital Data Sets
    • Laboratory Data Sets
    • Radiology Data Sets
    • Covered Medicare Contractors
    • Technical FAQ
    • Pre-Sales FAQ
    • Support
    • Data File Partners
  • ICD-10 Descriptor File
  • CLIA Database
  • Support
  • Order Form
• CodeMap® Online
  • About CodeMap® Online
  • ICD-10 Search
  • Procedure Hierarchy
  • CCI/MUE Edit Report
  • Medical Necessity Check
  • NPI Market Analysis Search
  • LCDs and Articles by Medicare Contractor
  • National Coverage Determinations (NCDs)
  • Latest LCD Report
  • Upcoming LCD Revisions
  • Order Now
• Industry Resources
  • Using Part B Medicare Claims Data to Project Market Size and Growth
  • Using Medicare Claims Data / CLIA Certificate Data to Determine Market Characteristics
  • Coding and Reimbursement
    Web Sites
  • Using CLIA Certificate Data to target Marketing and Sales Efforts
• Briefings
  • 03/24/2025: OIG Report Shows 5% Drop in CLFS Spending
  • 02/13/2025: CLIA Waived Testing
  • 01/17/2025: Billing CPT 81479
  • 12/16/2024: January 1 Updates
  • 10/28/2024: 2025 Laboratory CPT Code Updates
• Return Policy
• About Us
  • Our location
  • Privacy Policy
  • Our Clients
  • Charles B. Root, Ph. D.
  • Gregory B. Root, Esq.
  • Jerry Tavolino
  • Linda Emmerich
  • Lara Tavolino
  • Abigail Tavolino
  • Pay an Invoice
  • Current W-9
  • Email Customer Service

W21.221S

Quick jump to specific ICD-10 (CM) Code:

W21.31XD

W2131XA utilizaton on OPPS claims.*


* Medicare Part A utilization data is derived from the 100% 2023 Outpatient (Fee-for-Service) Standard Analytical File.