Dr. William Joseph Mazzella, MD

Dr. Mazzella practices at Prisma Health Hillcrest Hospital in Simpsonville, South Carolina, part of Prisma Health.

Dr. Mazzella's NPI, 1528158227, was assigned on October 13, 2006. Dr. Mazzella graduated from University of North Carolina at Chapel Hill School of Medicine in 1998. Dr. Mazzella holds South Carolina license 35221.

Dr. Mazzella's primary practice is Prisma Health Hillcrest Hospital, at 741 South East Main Street, Simpsonville, SC 29681 in Greenville County. The practice phone is (864) 454-6100. Dr. Mazzella also practices at Hillcrest Hospital, 729 SE Main St, Simpsonville, SC 29681.

Dr. Mazzella's primary practice is Prisma Health Hillcrest Hospital in Simpsonville, South Carolina, part of Prisma Health. Dr. Mazzella is also affiliated with Prisma Health Greenville Memorial Hospital. The medical group on file is Prisma Health Medical Group. Dmand AI also links Dr. Mazzella to 2 more hospitals, 3 medical groups and 2 home health agencies, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mazzella practices, 6 sites in all. Vendor and product names are available with a free account.

Hospitalist is Dr. Mazzella's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dmand AI has Dr. Mazzella's licenses on file in 6 states: South Carolina, Colorado, Indiana, Kentucky, Louisiana and North Carolina.

CMS data shows 566 Medicare services from Dr. Mazzella across 6 procedure codes in 2024, for 227 Medicare patients. Medicare paid $48,732 for them. Every service was in a facility, such as a hospital, rather than an office.

CMS counts 227 Medicare patients who saw Dr. Mazzella in 2024. The largest group is 75 to 84, with 82 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 14% are also on Medicaid. Their average risk score is 2.37, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Mazzella's median patient age at 70, with 52% women.

In 2024, Dr. Mazzella wrote 515 Medicare Part D claims for 204 patients. 75% of them were for generic drugs. CMS names the drug for 239 of them, across 12 drugs with 11 or more claims each, at $47,685 in total drug cost. In 2023, CMS named 131 claims across 8 drugs.

Dr. Mazzella accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

CMS Open Payments shows 18 general payments to Dr. Mazzella from 7 drug and device companies from 2017 to 2025. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $355.

Dr. Mazzella graduated from University of North Carolina at Chapel Hill School of Medicine in 1998.