Established in 1985, National Health Resources, Inc. (NHR) is a management-consulting firm that specializes in assisting health care providers in assuring the proper billing and payment of claims for health care services. NHR services include reviews of medical records to verify ICD-10-CM/PCS coding (DRG validation) and CPT-4 coding (hospital, physician and related outpatient billing). NHR has a full roster of experienced consultants including credentialed medical record professionals, nurses, and physicians. NHR's DRG validation reviewers have analyzed over one million medical records over the course of the past 15 years.