Jon Stephen Portnoff, MD - Medicare Cardiovascular Disease (cardiology) in Ukiah, CA

Jon Stephen Portnoff, MD is a medicare enrolled "Internal Medicine - Cardiovascular Disease" physician in Ukiah, California. He graduated from medical school in 1984 and has 40 years of diverse experience with area of expertise as Cardiovascular Disease (cardiology). He is a member of the group practice Adventist Health Physicians Network, Ukiah Adventist Hospital, Willits Hospital Inc and his current practice location is 260 Hospital Dr, Suite 207, Ukiah, California. You can reach out to his office (for appointments etc.) via phone at (707) 463-2400.

Jon Stephen Portnoff is licensed to practice in California (license number A43219) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1609874445.

Contact Information

Jon Stephen Portnoff, MD
260 Hospital Dr, Suite 207,
Ukiah, CA 95482-4533
(707) 463-2400
(707) 463-3520

Map and Direction




Physician's Profile

Full NameJon Stephen Portnoff
GenderMale
SpecialityCardiovascular Disease (cardiology)
Experience40 Years
Location260 Hospital Dr, Ukiah, California
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Jon Stephen Portnoff graduated from medical school in 1984
  NPI Data:
  • NPI Number: 1609874445
  • Provider Enumeration Date: 07/13/2005
  • Last Update Date: 10/25/2012
  Medicare PECOS Information:
  • PECOS PAC ID: 6103881784
  • Enrollment ID: I20041123000368

Medical Identifiers

Medical identifiers for Jon Stephen Portnoff such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1609874445NPI-NPPES
00A432190MedicaidCA
ZZZ00872ZOtherCAMEDICARE PTAN
00A432190OtherCABLUE SHIELD OF CALIFORNIA
060020995OtherCARAILROAD MEDICARE

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RC0000XInternal Medicine - Cardiovascular Disease A43219 (California)Primary
207RI0011XInternal Medicine - Interventional Cardiology A43219 (California)Secondary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Adventist Health Ukiah ValleyUkiah, CAHospital
Adventist Health Howard MemorialWillits, CAHospital
Mendocino Coast District HospitalFort bragg, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Adventist Health Physicians Network3274580972544
Ukiah Adventist Hospital6406816123104
Willits Hospital Inc741694069745

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Jon Stephen Portnoff allows following entities to bill medicare on his behalf.
Entity NameWillits Hospital Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1356339543
PECOS PAC ID: 7416940697
Enrollment ID: O20040405000843
Entity NameUkiah Adventist Hospital
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1235120676
PECOS PAC ID: 6406816123
Enrollment ID: O20041015000818
Entity NameAdventist Health Physicians Network
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1063718583
PECOS PAC ID: 3274580972
Enrollment ID: O20050407000633
Entity NameAdventist Health Mendocino Coast
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1538113725
PECOS PAC ID: 3678990769
Enrollment ID: O20220620001667

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Jon Stephen Portnoff is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Jon Stephen Portnoff, MD
Po Box 2739,
Ukiah, CA 95482-2739

Ph: (707) 463-8000
Jon Stephen Portnoff, MD
260 Hospital Dr, Suite 207,
Ukiah, CA 95482-4533

Ph: (707) 463-2400

Reviews and Comments


Internal Medicine Doctors in Ukiah, CA

Dr. Guy Teran, M.D.
Cardiovascular Disease
Medicare: Accepting Medicare Assignments
Practice Location: 260 Hospital Dr, Ukiah, CA 95482
Phone: 707-463-8000    Fax: 707-462-1111
Christine Ives, M.D.
Cardiovascular Disease
Medicare: Accepting Medicare Assignments
Practice Location: 275 S Orchard Ave, Ukiah, CA 95482
Phone: 707-463-3440    Fax: 707-463-3446
Dr. Ronald Sean Batin, M.D.
Cardiovascular Disease
Medicare: Accepting Medicare Assignments
Practice Location: 232 Hospital Dr Ste A, Ukiah, CA 95482
Phone: 707-467-3189    
Linda Louise Mulligan, M.D.
Cardiovascular Disease
Medicare: Medicare Enrolled
Practice Location: 630 Kings Ct, Ukiah, CA 95482
Phone: 707-468-7700    
Harry Berj Matossian, M.D.
Cardiovascular Disease
Medicare: Medicare Enrolled
Practice Location: 234 Hospital Dr, Ukiah, CA 95482
Phone: 707-462-0681    Fax: 707-462-4647
Iyad Hanna, MD
Cardiovascular Disease
Medicare: Accepting Medicare Assignments
Practice Location: 260 Hospital Dr, Suite 103, Ukiah, CA 95482
Phone: 707-463-8028    Fax: 707-462-7382
Benjamin H Meyer, M.D.
Cardiovascular Disease
Medicare: Not Enrolled in Medicare
Practice Location: 115 Hospital Dr, Ukiah, CA 95482
Phone: 707-463-2400    Fax: 707-463-3520

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.