Dr John Whitney Mercer Jr, MD - Medicare Obstetrics/gynecology in Nampa, ID

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Dr John Whitney Mercer Jr, MD is a medicare enrolled "Obstetrics & Gynecology" physician in Nampa, Idaho. He graduated from medical school in 1997 and has 29 years of diverse experience with area of expertise as Obstetrics/gynecology. He is a member of the group practice Saint Alphonsus Regional Medical Center Inc, Minden Physician Practices Llc and his current practice location is 4424 E Flamingo Ave Ste 200, Nampa, Idaho. You can reach out to his office (for appointments etc.) via phone at (208) 302-1400.

Dr John Whitney Mercer Jr is licensed to practice in Idaho (license number 3971468) 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 1205988540.

Contact Information

Dr John Whitney Mercer Jr, MD
4424 E Flamingo Ave Ste 200,
Nampa, ID 83687-9300
(208) 302-1400
(208) 302-1455

Map and Direction




Physician's Profile

Full NameDr John Whitney Mercer Jr
GenderMale
SpecialityObstetrics/gynecology
Experience29 Years
Location4424 E Flamingo Ave Ste 200, Nampa, Idaho
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 Whitney Mercer Jr graduated from medical school in 1997
  NPI Data:
  • NPI Number: 1205988540
  • Provider Enumeration Date: 01/17/2007
  • Last Update Date: 09/02/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 5193610897
  • Enrollment ID: I20250915003656

Medical Identifiers

Medical identifiers for Dr John Whitney Mercer Jr such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1205988540NPI-NPPES
1487163MedicaidLA
9000166884MedicaidCO
L023779OtherLASTATE LICENSE

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207V00000XObstetrics & Gynecology L023779 (Louisiana)Secondary
207V00000XObstetrics & Gynecology CDR.0000210 (Colorado)Secondary
207V00000XObstetrics & Gynecology 3971468 (Idaho)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Minden Medical CenterMinden, LAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Saint Alphonsus Regional Medical Center Inc3476462359672
Minden Physician Practices Llc478972000448

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 Whitney Mercer Jr allows following entities to bill medicare on his behalf.
Entity NameSaint Alphonsus Regional Medical Center Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1649357716
PECOS PAC ID: 3476462359
Enrollment ID: O20040204001036

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 Whitney Mercer Jr 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 Whitney Mercer Jr, MD
715 S 3rd St,
Montrose, CO 81401-4209

Ph: (970) 249-6737		Dr John Whitney Mercer Jr, MD
4424 E Flamingo Ave Ste 200,
Nampa, ID 83687-9300

Ph: (208) 302-1400

Reviews and Comments


Obstetrics & Gynecology Doctors in Nampa, ID

Dr. Linda Kay Walker, MD
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 4424 E Flamingo Ave, Ste 200, Nampa, ID 83687
Phone: 208-302-1400    Fax: 208-302-1455
Dr. Kenneth Leif Nathaniel Sjoren, DO
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 9850 W St Lukes Dr Ste 229, Nampa, ID 83687
Phone: 208-205-7700    Fax: 208-205-7701
Dr. Robert W Chalmers, M.D.
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 9850 W St Lukes Dr, Nampa, ID 83687
Phone: 208-381-2267    Fax: 208-381-4314
Dr. Juliette Evelyn Hughes, MD
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 1611 B 12th Ave Rd, Nampa, ID 83686
Phone: 208-442-8035    Fax: 208-442-8038
Dr. Megan E Kasper,
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 9850 St Lukes Dr, Nampa, ID 83687
Phone: 208-463-3000    Fax: 208-463-3047
Dr. Justin Bruner, D.O.
Obstetrics & Gynecology
Medicare: Medicare Enrolled
Practice Location: 9850 W St Lukes Dr, Nampa, ID 83687
Phone: 208-381-2267    
Ryan Pettit, DO
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 4424 E Flamingo, Ste 200, Nampa, ID 83687
Phone: 208-302-1400    Fax: 208-302-1455

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.