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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. 
 
IMRT is clinically indicated when highly conformal dose planning is required. IMRT planning may be 
clinically indicated when one or more of the following conditions are present: 
 An immediately adjacent area has been previously irradiated and abutting portals must be established 
with high precision. 
 Dose escalation is planned to deliver radiation doses in excess of those commonly utilized for similar 
tumors with conventional treatment. 
 The target volume is concave or convex, and the critical normal tissues are within or around that 
convexity or concavity. 
 The target volume is in close proximity to critical structures that must be protected. 
 The volume of interest must be covered with narrow margins to adequately protect immediately 
adjacent structures. 
On the basis of the above conditions demonstrating medical necessity, disease sites that may support the use of 
IMRT include the following: 
 Primary, metastatic or benign tumors of the central nervous system including the brain, the brain stem, 
and spinal cord 
 Primary or metastatic tumors of the spine where the spinal cord tolerance may be exceeded with 
conventional treatment or where the spinal cord has previously been irradiated 
 Primary, metastatic, benign or recurrent head and neck malignancies, including: orbits, sinuses, skull 
base, aero-digestive tract, and salivary glands 
 Thoracic malignancies 
 Abdominal malignancies when dose constraints to small bowel or other normal abdominal tissue are 
exceeded and present administration of a therapeutic dose 
 Pelvic malignancies including: prostatic, gynecological and anal carcinoma 
 Other pelvic or retroperitoneal malignancies. 
Other malignancies not delineated in the above can be supported with submission of documentation for medical 
necessity should a denial occur. The determination of appropriateness and medical necessity for IMRT for any 
site shall be found in the documentation from the radiation oncologist and must be available when requested or 
submitted in the appeals process.  
Limitations: 
IMRT is not considered reasonable and necessary when at least one of the criteria listed in the "Coverage 
Indications, Limitations, and/or Medical Necessity" section of this LCD are not present. 
Clinical scenarios that would not typically support the use of IMRT include: 
 where IMRT does not offer an advantage over conventional or three-dimensional conformal radiation 
therapy techniques that deliver good clinical outcomes and low toxicity 
 clinical urgency, such as spinal cord compression, superior vena cave syndrome or airway obstruction 
 palliative treatment of metastatic disease where the prescribed dose does not approach normal tissue 
tolerances 
 inability to accommodate for organ motion, such as for a mobile lung tumor 
 inability of the patient to cooperate and tolerate immobilization to permit accurate and reproducible 
dose delivery 
You can find this rule in the Local Coverage Determination (LCD): Intensity Modulated Radiation Therapy 
(IMRT) (L36773). 
 
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.