Dr John Stephen Hammes, MD - Medicare Nephrology in San Diego, CA

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Dr John Stephen Hammes, MD is a medicare enrolled "Internal Medicine - Nephrology" physician in San Diego, California. He went to Uniformed Services Uhs Fe Hebert School Of Med and graduated in 1993 and has 31 years of diverse experience with area of expertise as Nephrology. He is a member of the group practice Balboa Nephrology Medical Group Inc and his current practice location is 4060 Fourth Ave, Suite 220, San Diego, California. You can reach out to his office (for appointments etc.) via phone at (619) 299-2350.

Dr John Stephen Hammes is licensed to practice in California (license number G84351) 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 1891766994.

Contact Information

Dr John Stephen Hammes, MD
4060 Fourth Ave, Suite 220,
San Diego, CA 92103-2116
(619) 299-2350
(619) 297-8379

Map and Direction




Physician's Profile

Full NameDr John Stephen Hammes
GenderMale
SpecialityNephrology
Experience31 Years
Location4060 Fourth Ave, San Diego, 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:
  • Dr John Stephen Hammes attended and graduated from Uniformed Services Uhs Fe Hebert School Of Med in 1993
  NPI Data:
  • NPI Number: 1891766994
  • Provider Enumeration Date: 01/28/2006
  • Last Update Date: 01/29/2021
  Medicare PECOS Information:
  • PECOS PAC ID: 7012166432
  • Enrollment ID: I20120928000492

Medical Identifiers

Medical identifiers for Dr John Stephen Hammes such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1891766994NPI-NPPES
CB204086OtherCASO CA MEDICARE PTAN
G84351OtherCACA LICENSE
CA125550OtherCANO CA MEDICARE PTAN

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RN0300XInternal Medicine - Nephrology G84351 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Fmc-gateway Dialysis Center-eastSan diego, CADialysis facility
Fmc-balboa South Bay Home TherapiesChula vista, CADialysis facility
Fmc-balboa Kearny Mesa Dialysis CenterSan diego, CADialysis facility
Scripps Mercy HospitalSan diego, CAHospital
Sharp Coronado Hospital And Hlthcr CtrCoronado, CAHospital
Sharp Memorial HospitalSan diego, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Balboa Nephrology Medical Group Inc963816401573

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. Dr John Stephen Hammes allows following entities to bill medicare on his behalf.
Entity NameRegents Of The University Of California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1578672184
PECOS PAC ID: 3577476761
Enrollment ID: O20031211000464
Entity NameBalboa Nephrology Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1316997505
PECOS PAC ID: 9638164015
Enrollment ID: O20040415001031
Entity NameEmergency And Acute Care Medical Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1437103942
PECOS PAC ID: 9537108279
Enrollment ID: O20050502000734
Entity NameOn Call Specialists Medical Group Of San Diego Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1962175836
PECOS PAC ID: 7911395231
Enrollment ID: O20211019001466

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. Dr John Stephen Hammes 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
Dr John Stephen Hammes, MD
4225 Executive Sq Ste 450,
La Jolla, CA 92037-8411

Ph: (858) 810-0000		Dr John Stephen Hammes, MD
4060 Fourth Ave, Suite 220,
San Diego, CA 92103-2116

Ph: (619) 299-2350

Reviews and Comments


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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).

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