Dr Gregory O'neal Clark, MD - Internal Medicine in Buffalo Grove, IL

Dr Gregory O'neal Clark, MD is a Internal Medicine - Endocrinology, Diabetes & Metabolism physician based in Buffalo Grove, Illinois. Dr Gregory O'neal Clark is licensed to practice in Illinois (license number 336.093729) and his current practice location is 355 W Dundee Rd Ste 110, Buffalo Grove, Illinois. He can be reached at his office (for appointments etc.) via phone at (847) 541-4878.

NPI number for Dr Gregory O'neal Clark is 1053363952 and his current mailing address is 920 Grandview Ln, Lake Forest, Illinois. He does not participate in medicare program and thus does not accept medicare assignments. His NPI Number is 1053363952.

Contact Information

Dr Gregory O'neal Clark, MD
355 W Dundee Rd Ste 110,
Buffalo Grove, IL 60089-3500
(847) 541-4878
(847) 520-0500

Map and Direction




Physician's Profile

Full NameDr Gregory O'neal Clark
GenderMale
SpecialityInternal Medicine - Endocrinology, Diabetes & Metabolism
Location355 W Dundee Rd Ste 110, Buffalo Grove, Illinois
Accepts Medicare AssignmentsDoes not participate in Medicare Program. He may not accept medicare assignment.
  NPI Data:
  • NPI Number: 1053363952
  • Provider Enumeration Date: 05/17/2006
  • Last Update Date: 07/26/2023

Medical Identifiers

Medical identifiers for Dr Gregory O'neal Clark such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1053363952NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RE0101XInternal Medicine - Endocrinology, Diabetes & Metabolism 336.093729 (Illinois)Primary

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 Gregory O'neal Clark is NOT enrolled with medicare and thus cannot prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr Gregory O'neal Clark, MD
920 Grandview Ln,
Lake Forest, IL 60045-3914

Ph: (443) 823-0583
Dr Gregory O'neal Clark, MD
355 W Dundee Rd Ste 110,
Buffalo Grove, IL 60089-3500

Ph: (847) 541-4878

Reviews and Comments


Internal Medicine Doctors in Buffalo Grove, IL

Mr. Mark J Charman, M.D.
Endocrinology, Diabetes & Metabolism
Medicare: Accepting Medicare Assignments
Practice Location: 600 W Lake Cook Rd, Buffalo Grove, IL 60089
Phone: 847-632-1880    Fax: 847-520-6095
Olga Zarkh, MD
Endocrinology, Diabetes & Metabolism
Medicare: Accepting Medicare Assignments
Practice Location: 135 N Arlington Heights Rd Ste 160, Buffalo Grove, IL 60089
Phone: 847-818-7700    Fax: 847-818-1718
Dr. Sarah Cathleen Peterson, M.D.
Endocrinology, Diabetes & Metabolism
Medicare: Accepting Medicare Assignments
Practice Location: 15 S Mchenry Rd, Buffalo Grove, IL 60089
Phone: 847-618-0326    Fax: 847-618-0762
Dr. Chuck Richard Vrasich, MD
Endocrinology, Diabetes & Metabolism
Medicare: Accepting Medicare Assignments
Practice Location: 15 S Mchenry Rd, Buffalo Grove, IL 60089
Phone: 847-618-0351    Fax: 847-618-0766
Dr. Susan E Nelson, M.D.
Endocrinology, Diabetes & Metabolism
Medicare: Accepting Medicare Assignments
Practice Location: 15 S Mchenry Rd, Buffalo Grove, IL 60089
Phone: 847-618-0351    Fax: 847-618-0766
Dr. Irina Goldvekht, D.O.
Endocrinology, Diabetes & Metabolism
Medicare: Accepting Medicare Assignments
Practice Location: 15 S Mchenry Rd, Buffalo Grove, IL 60089
Phone: 847-618-0351    Fax: 847-618-0766

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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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