
Greenfield Associates, M.D., P.A.
Quick Facts
| Practice Type | Hybrid |
| Location | Annapolis, Anne Arundel |
| Doctors | Erika Benns M.D., Internal Medicine, Charles Phelps M.D., Internal Medicine |
| Telehealth Type | Telemedicine visits (telephone and video) |
| Insurance Accepted | Medicare |
| Telehealth Available | Yes |
About
Greenfield Associates, M.D., P.A., two internists deliver primary and preventive care to adults in Annapolis, Maryland. Dr. Charles W. Phelps and Dr. Erika Benns lead the practice. Both physicians bring deep clinical experience to every patient relationship.
The practice runs a hybrid model, offering both standard and concierge-level access through the Concierge Choice program. On-site diagnostics include EKG, bone densitometry, pulmonary function testing, and vascular screening. The lab handles point-of-care testing for common clinical needs. Telemedicine visits run Monday through Friday, 9am to 5pm. The practice holds hospital affiliations with Anne Arundel Medical Center, Johns Hopkins Hospital, University of Maryland Medical Center, and Washington Hospital Center. A wellness partnership with coach Michele McCambridge, MPH rounds out the care offerings.
Details
Address
139 Old Solomons Island Road, Annapolis, MD 21401
Phone
(410) 224-2222Website
Visit websiteMembership Details
Concierge Choice program available; membership service number (877) 888-5565 or members@choice.md. No specific pricing listed on website.
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Frequently Asked Questions
The Concierge Choice program gives members enhanced access to their physician at Greenfield Associates. Members reach their doctor 24 hours a day, 7 days a week through a dedicated phone number. The program includes same-day or next-day appointments and extended, unhurried office visits. Members also receive in-patient hospital follow-up care at Anne Arundel Medical Center and a portable USB device containing their comprehensive physical information. md.
Greenfield Associates participates with Medicare. The practice does not participate with commercial insurance companies, but the team facilitates out-of-network claims on behalf of patients. Membership fees for the Concierge Choice program fall outside of insurance coverage.
Yes. The practice offers same-day appointments. Concierge Choice members also have access to next-day scheduling and 24/7 physician availability by phone.
Yes. Greenfield Associates offers telemedicine visits Monday through Friday, 9am to 5pm. Patients can connect with their physician virtually for a range of primary care concerns during those hours.
The practice runs an on-site laboratory with point-of-care diagnostics. On-site physiologic testing includes EKG, bone densitometry, pulmonary function testing, and vascular screening. The lab also handles blood sugar testing, urinalysis, rapid influenza and strep testing, prothrombin time testing, and occult blood testing.
Greenfield Associates holds affiliations with Anne Arundel Medical Center, Johns Hopkins Hospital, University of Maryland Medical Center, and Washington Hospital Center. Concierge members receive in-patient follow-up care at Anne Arundel Medical Center directly through the practice.
Yes. The physicians at Greenfield Associates recognize the value of multiple disciplines in patient care. The practice works alongside chiropractors, acupuncturists, and alternative medicine providers as part of an integrated approach. The team also partners with wellness coach Michele McCambridge, MPH through the Motivated Mondays program.
Prospective patients can contact the practice directly by calling (410) 224-2222. md.
Greenfield Associates focuses on adult primary care. Both physicians specialize in internal medicine and tailor their care to the health needs of adult patients.
Practice last updated March 22, 2026


