Gregory S Larsen, DO - Medicare Emergency Medicine in Colton, CA

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Gregory S Larsen, DO is a medicare enrolled "Emergency Medicine" physician in Colton, California. He graduated from medical school in 2007 and has 18 years of diverse experience with area of expertise as Emergency Medicine. He is a member of the group practice Pacific Redwood Medical Group Inc, San Francisco Emergency Medical Associates, Cep America - California and his current practice location is 400 N Pepper Ave, Colton, California. You can reach out to his office (for appointments etc.) via phone at (909) 580-1000.

Gregory S Larsen is licensed to practice in California (license number 20A10521) 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 1104073709.

Contact Information

Gregory S Larsen, DO
400 N Pepper Ave,
Colton, CA 92324-1801
(909) 580-1000
Not Available

Map and Direction




Physician's Profile

Full NameGregory S Larsen
GenderMale
SpecialityEmergency Medicine
Experience18 Years
Location400 N Pepper Ave, Colton, 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:
  • Gregory S Larsen graduated from medical school in 2007
  NPI Data:
  • NPI Number: 1104073709
  • Provider Enumeration Date: 08/26/2008
  • Last Update Date: 10/30/2009
  Medicare PECOS Information:
  • PECOS PAC ID: 2163568759
  • Enrollment ID: I20091013000382

Medical Identifiers

Medical identifiers for Gregory S Larsen such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1104073709NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine 20A10521 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Mendocino Coast District HospitalFort bragg, CAHospital
Marinhealth Medical CenterGreenbrae, CAHospital
Sutter Santa Rosa Regional HospitalSanta rosa, CAHospital
Adventist Health Howard MemorialWillits, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Pacific Redwood Medical Group Inc549665270355
San Francisco Emergency Medical Associates569866251867
Cep America - California61037391311093

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. Gregory S Larsen allows following entities to bill medicare on his behalf.
Entity NameCep America - California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1023063542
PECOS PAC ID: 6103739131
Enrollment ID: O20031106000520
Entity NamePacific Redwood Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1033103676
PECOS PAC ID: 5496652703
Enrollment ID: O20031215000997
Entity NameSan Francisco Emergency Medical Associates
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1134110661
PECOS PAC ID: 5698662518
Enrollment ID: O20040303001130
Entity NameNapa Valley Emergency Medical Group
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1467463539
PECOS PAC ID: 5698664977
Enrollment ID: O20040419000856
Entity NameChase Dennis Emergency Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1033152350
PECOS PAC ID: 2264345172
Enrollment ID: O20041109001017
Entity NamePacific Redwood Medical Services
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1295924470
PECOS PAC ID: 6204913767
Enrollment ID: O20080408000421

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. Gregory S Larsen 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
Gregory S Larsen, DO
312 Notre Dame Rd,
Claremont, CA 91711-5136

Ph: (909) 399-3609		Gregory S Larsen, DO
400 N Pepper Ave,
Colton, CA 92324-1801

Ph: (909) 580-1000

Reviews and Comments


Emergency Medicine Doctors in Colton, CA

Eugene Lawrence Kwong, M.D
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 400 N. Pepper Avenue, Colton, CA 92324
Phone: 909-580-1400    
Gregory M. Fenati, D.O.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 400 N Pepper Ave, Colton, CA 92324
Phone: 858-344-7049    
Dr. Aaron Ho, DO
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 400 N Pepper Ave Ste 1m107, Colton, CA 92324
Phone: 909-580-2159    
Niluk Leon Senewiratne, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 400 N Pepper Ave, Colton, CA 92324
Phone: 909-580-1000    
Dr. Vikram Raj, D.O.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 400 N Pepper Ave Ste 107, Colton, CA 92324
Phone: 909-580-1802    
Travis Patrick Martin, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1850 E Washington St, Colton, CA 92324
Phone: 909-887-2991    Fax: 909-887-2991
Robert Sexton Kollen, M.D
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 400 N. Pepper Avenue, Colton, CA 92324
Phone: 909-580-1400    

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.

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