HealthCareAtlasUSA

This site republishes official CMS/Medicare Care Compare data. It is not medical advice and does not recommend any specific hospital or treatment — for medical decisions, talk to a doctor.

Doctors / CA

JON S PORTNOFF, MD

CARDIOVASCULAR DISEASE (CARDIOLOGY)

Graduated: 1984

NPI: 1609874445

Practice Locations (6)

ADVENTIST HEALTH PHYSICIANS NETWORK

15322 LAKESHORE DR

CLEARLAKE, CA 954229815

ADVENTIST HEALTH PHYSICIANS NETWORK

115 HOSPITAL DR

UKIAH, CA 954824591

7074632400

UKIAH ADVENTIST HOSPITAL

245 HOSPITAL DR

UKIAH, CA 954824531

7074623111

UKIAH ADVENTIST HOSPITAL

275 HOSPITAL DR

UKIAH, CA 954824531

7074623111

WILLITS HOSPITAL INC

1 MARCELA DR

WILLITS, CA 954905769

7074596801

WILLITS HOSPITAL INC

3 MARCELA DR, SUITE D

WILLITS, CA 954905769

7074594220

Source: CMS National Downloadable File, September 2026.

JON PORTNOFF, MD | HealthCareAtlasUSA