Dr. Mark Parker, MD
Not yet claimedNephrologist, Hypertension specialist · Physician (MD)
Portland, ME
Dr. Mark Parker is a kidney doctor with MaineHealth Nephrology in Portland, Maine, where he has practiced since 1999. He treats chronic kidney disease, polycystic kidney disease, hard-to-control high blood pressure, and kidney transplant patients.
About Dr. Mark Parker, MD
Updated Sep 20, 2026 · next review Dec 19, 2026Dr. Mark G. Parker is a kidney doctor (nephrologist) who has practiced with MaineHealth in Portland, Maine since 1999, with a second listed location in Biddeford. His clinical work focuses on chronic kidney disease, polycystic kidney disease, complex high blood pressure, and kidney transplantation (https://www.mainehealth.org/providers/mark-g-parker-md).
He earned his medical degree at the University of Connecticut School of Medicine in 1989 and trained in internal medicine and nephrology at Tufts Medical Center, plus a short fellowship in kidney ultrasound at Emory University (https://facultyprofiles.tufts.edu/mark-parker). He is a clinical faculty member at Tufts University School of Medicine and teaches in Maine Medical Center's nephrology fellowship, which he directed from 2002 to 2016 (https://www.mitemainehealth.org/speakers-bureau/mark-parker-md/).
Beyond patient care, he serves as Vice President of Quality and Safety at MaineHealth Maine Medical Center in Portland, a role he has held since 2017, overseeing patient safety, risk management, and infection prevention (https://www.mainehealth.org/maine-medical-center/about-mainehealth-maine-medical-center/leadership-mainehealth-maine-medical-center). Nationally, he has chaired the American Society of Nephrology Workforce Committee and has written several journal articles about training the next generation of kidney doctors (https://pmc.ncbi.nlm.nih.gov/articles/PMC8729413/).
CMS Open Payments records list one industry payment totaling $12.48 between 2021 and 2025, from Otsuka America Pharmaceutical. Payments from industry to doctors are common and legal; this amount is very small (https://openpaymentsdata.cms.gov/). No public statements on vaccines, supplements, or alternative medicine were found, and he does not appear to produce patient-facing content on social media.
- Kidney and blood pressure care
- He treats chronic kidney disease, polycystic kidney disease, complex hypertension, and kidney transplant patients at MaineHealth Nephrology. mainehealth.org
- Board certification listings
- Directory listings show board certification in Internal Medicine and Nephrology from the American Board of Internal Medicine. doctor.webmd.com
- Hospital quality leader
- Since 2017 he has been Vice President of Quality and Safety at MaineHealth Maine Medical Center, and is also described as Associate Chief Quality Officer for MaineHealth. mainehealth.org
- National society role
- He chaired the American Society of Nephrology Workforce Committee, which studies and supports the supply of kidney specialists. pmc.ncbi.nlm.nih.gov
- Published research on training
- He co-authored papers in CJASN and Advances in Chronic Kidney Disease about the nephrology workforce and recruiting new nephrologists. pubmed.ncbi.nlm.nih.gov
- Teaching appointment
- He holds a faculty appointment as clinical associate professor of medicine at Tufts University School of Medicine. facultyprofiles.tufts.edu
- Fellowship program director
- He was Chief of the Division of Nephrology and Transplantation at Maine Medical Center and directed its nephrology fellowship from 2002 to 2016. mitemainehealth.org
- Patient safety training
- He completed Institute for Healthcare Improvement certificate programs in Improvement Advisor and Patient Safety Executive work. mainehealth.org
- Work on lab result reporting
- In October 2024 he described a MaineHealth project aimed at reducing misdiagnoses by speeding up reporting of critical lab results. hcinnovationgroup.com
- Hospital affiliations
- He is affiliated with MaineHealth Maine Medical Center in Portland and Northern Light Mercy Hospital. health.usnews.com
Worth knowing
- Training details differ between sources. An aggregator site lists his internship, residency, and fellowship at Beth Israel Deaconess Medical Center, while Tufts and MaineHealth list Tufts Medical Center. The institutional sources are generally more reliable, but the conflict is unresolved. care.healthline.com
- No license discipline, lawsuits, or criminal matters surfaced in web searching, but the Maine Board of Licensure in Medicine's own verification database was not checked during this research. Patients can confirm license status directly with the state board. maine.gov
- A LinkedIn profile matching his name, employer, education, and location exists but was not independently confirmed as his, and shows little activity. linkedin.com
Industry payments (CMS Open Payments)
Open the CMS recordFederal law requires drug and device companies to report what they pay clinicians: meals, travel, speaking, consulting, and research. Payments are common and legal; the point is that you can see them.
2021 to 2025
$12
1 payment
| 2021 | $12 |
| 2022 | $0 |
| 2023 | $0 |
| 2024 | $0 |
| 2025 | $0 |
Top payers
- Otsuka America Pharmaceutical, Inc.$12
Payment types
- Education$12
A word of caution about these numbers
A payment does not mean your doctor is compromised or acting unethically. Most of these entries are drug samples left for patients, or lunch brought in for the office staff, and the amounts are usually small. Research funding and speaking at medical meetings are also normal parts of a clinical career.
As a rough guide, a total under $15,000 a year is usually not a concern. Much larger sums, especially from one company whose product your doctor recommends to you, are worth asking about. You are allowed to ask.
Sources: mainehealth.org · mainehealth.org · facultyprofiles.tufts.edu · mitemainehealth.org · doximity.com · researchgate.net · linkedin.com · healthgrades.com. Something wrong or out of date? Tell us and we will correct it.
Summary prepared with AI assistance from the public sources linked above, reviewed every three months. It is not a review, a rating, or an endorsement.
Practice location
MaineHealth Nephrology (Maine Medical Partners)
22 Bramhall St
Portland, ME 04102
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