Stephen Louis Walston, MD - Medicare Internal Medicine in Mercer Island, WA

Stephen Louis Walston, MD is a medicare enrolled "Internal Medicine" physician in Mercer Island, Washington. He went to University Of Texas Medical School At Houston and graduated in 2010 and has 14 years of diverse experience with area of expertise as Internal Medicine. He is a member of the group practice Swedish Health Services and his current practice location is 3236 78th Ave Se Ste 200, Mercer Island, Washington. You can reach out to his office (for appointments etc.) via phone at (206) 386-9500.

Stephen Louis Walston is licensed to practice in Washington (license number MD60423761) 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 1578887519.

Contact Information

Stephen Louis Walston, MD
3236 78th Ave Se Ste 200,
Mercer Island, WA 98040-3500
(206) 386-9500
(206) 386-9605

Map and Direction




Physician's Profile

Full NameStephen Louis Walston
GenderMale
SpecialityInternal Medicine
Experience14 Years
Location3236 78th Ave Se Ste 200, Mercer Island, Washington
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:
  • Stephen Louis Walston attended and graduated from University Of Texas Medical School At Houston in 2010
  NPI Data:
  • NPI Number: 1578887519
  • Provider Enumeration Date: 03/19/2010
  • Last Update Date: 11/11/2021
  Medicare PECOS Information:
  • PECOS PAC ID: 9830335363
  • Enrollment ID: I20140213000002

Medical Identifiers

Medical identifiers for Stephen Louis Walston such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1578887519NPI-NPPES
1578887519MedicaidWA
2022131MedicaidWA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine MD60423761 (Washington)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Swedish IssaquahIssaquah, WAHospital
Swedish Medical CenterSeattle, WAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Swedish Health Services9537072814323

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. Stephen Louis Walston allows following entities to bill medicare on his behalf.
Entity NameSwedish Health Services
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1831139724
PECOS PAC ID: 9537072814
Enrollment ID: O20031112000189
Entity NameKaiser Foundation Health Plan Of Washington
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1396810701
PECOS PAC ID: 9032022579
Enrollment ID: O20031112000454
Entity NameKing County Finance
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1306903604
PECOS PAC ID: 8022913789
Enrollment ID: O20031204001111
Entity NameThe Polyclinic
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1174594634
PECOS PAC ID: 2163328196
Enrollment ID: O20031210000788
Entity NameSwedish Health Services
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1689612954
PECOS PAC ID: 0244138196
Enrollment ID: O20031230000187

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. Stephen Louis Walston 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
Stephen Louis Walston, MD
Po Box 25608,
Salt Lake City, UT 84125-0608

Ph: (206) 320-4476
Stephen Louis Walston, MD
3236 78th Ave Se Ste 200,
Mercer Island, WA 98040-3500

Ph: (206) 386-9500

Reviews and Comments


Internal Medicine Doctors in Mercer Island, WA

Neeti Mittal, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 7707 Se 27th St, #104, Mercer Island, WA 98040
Phone: 206-275-3588    Fax: 206-275-2073
Dr. Steven Bruce Dunning, MD
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 3016 78th Ave Se, Mercer Island, WA 98040
Phone: 206-232-4588    Fax: 206-236-9009
Paul B Sytman, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 3236 78th Ave Se, Suite 200, Mercer Island, WA 98040
Phone: 206-275-5060    Fax: 206-275-5061
Dr. Daniel L. Kent, M.D.
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 8465 Se 83rd St, Mercer Island, WA 98040
Phone: 206-232-7649    Fax: 206-232-1102
Linda Rosenstock, MD
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 6140 E Mercer Way, Mercer Island, WA 98040
Phone: 310-487-8495    
Dr. Fredric Tobis, M.D.
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 7411 Se 36th St, Mercer Island, WA 98040
Phone: 206-853-3336    
Dr. Kendra Grace Gil, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 3236 78th Ave Se, Mercer Island, WA 98040
Phone: 206-275-5060    Fax: 206-275-5061

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.