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The rules say that plans must pay for a medical service or item if regular Medicare would pay for it in this case. 
You can find this rule at 42 Code of Federal Regulations (CFR) Section 422.101. 
 
The rules say that the Centers for Medicare and Medicaid Service (CMS) has established units of service edits 
referred to as Medically Unlikely Edits (MUEs). An MUE for a Healthcare Common Procedure Coding System 
(HCPCS)/Current Procedural Terminology (CPT) code is the maximum number of units of service under most 
circumstances allowable by the same provider for the same enrollee on the same date of service. Claims 
submitted where the unit of service exceeds the MUE value for that HCPCS/CPT code will be denied.   
 
Beginning on April 1, 2013, CMS introduced the MUE Adjudication Indicator (MAI) to differentiate between 
types of MUEs. If a code has an MAI of 1, appropriate use of a modifier may be used to report the same code 
on separate lines of the claim. MUEs for codes with an MAI of 2 are absolute date of service edits. These are 
per day edits based on policy. Codes with an MAI of 2 have been rigorously reviewed and vetted within 
CMS and obtain this MAI designation because units of service on the same date of service (DOS) in excess of 
the MUE value would be considered impossible because it was contrary to statute, regulation, or subregulatory 
guidance. 
 
You can find this rule in the Centers for Medicare and Medicaid Services, Medicare National Correct Coding 
Initiative Policy Manual for Medicare Services, Chapter I(V). 
 
The rules say edits based on established CMS policies may limit unit of service (UOS). For example, the MUE 
value for a surgical procedure may be based on the bilateral surgery indicator on the Medicare Physician Fee 
Schedule Database (MPFSDB). If the bilateral surgery indicator is "1", a bilateral surgical procedure must be 
reported with "1" unit of service and modifier 50 (bilateral modifier). You can find this rule in the Centers for 
Medicare and Medicaid Services, Medicare National Correct Coding Initiative Policy Manual for Medicare 
Services, Chapter I(V). 
 
The rules say that the Correct Coding Initiative was developed to promote correct coding and to control 
improper coding leading to inappropriate payment in Part B claims. An add-on code is eligible for payment 
only if it is reported with an appropriate primary procedure performed by the same practitioner. An add-on code is not eligible for payment if it is the only procedure reported by a practitioner. The only exception is as 
follows:  
 
For the same date of service only one physician of the same specialty in the group practice may report code 
99291 (primary) with or without code 99292 (add-on), and the other physician(s) must report their critical care 
services with CPT code 99292. 
 
You can find this rule in the Centers for Medicare and Medicaid Services, Internet Only Manual, Publication 
100-04, Medicare Claims Processing Manual, Chapter 23, Section 20.9. 
 
If you want to read these Medicare rules, you can go to this website www.medicareappeal.com. 
 
The Plan contract says that the Plan covers items and services in accordance with Medicare rules.