Mary Parker Johnstone
Mary Parker Johnstone is a Physician Assistant based in Cambridge, MA with over 5 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
Mary Parker Johnstone specializes in medical, serving patients in Cambridge, MA in independent practice. She completed training at University of Tennessee, Hsc, College of Medicine in 2021 and is early in her career. She regularly sees Medicare patients with hypertension, high cholesterol, and arthritis (per CMS claims data).
Older · 1114dNPPES updated 2023-05-05 · verify NPI on CMS · Verify license at Massachusetts Board of Registration in Medicine
How Does This Doctor Compare?
MIPS Score
202374.96/100
Massachusetts avg: 87.4 · US avg: 83.6
⚠ Lower than most doctors nationally(-8.6 pts)
How the government rates this doctor's Medicare care quality. Scores above 75 are considered good.
Medicare Patients
64
Unique beneficiaries
Standard volumePrescription Recipients
43
Patients prescribed
Prescriptions Written
47
Total claims
Total Medicare drug cost: $4k
Percentile rankings compared against 1,606 reporting peers in Massachusetts.
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages Hypertension, High Cholesterol, and Arthritis.
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%↑ More patients than average (+5%) — a focus area for this doctor
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↑ More patients than average (+5%) — a focus area for this doctor
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↑ More patients than average (+15%) — a focus area for this doctor
Reduced blood flow to the heart muscle, commonly known as coronary artery disease
US avg: 31.7%↑ More patients than average (+4%) — a focus area for this doctor
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↓ Fewer patients than average (-3%) — less common here
Excessive worry or fear that interferes with daily life
US avg: 34.1%↓ Fewer patients than average (-14%) — less common here
Conditions affecting emotional state, including depression and bipolar disorder
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
Patient Reviews
No patient reviews yet. If you've seen Mary Parker Johnstone, your feedback helps other patients.
Review PolicyAll feedback is moderated before publishing. We verify reviewer identity where possible and enforce a one-review-per-provider policy. Full guidelines →
Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 2021
University of Tennessee Health Science Center
Board certified · May 4, 2023
Self-reported via NPPES
5 years in practice
Established
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
Taxonomy: 363A00000X
Education & Training
University of Tennessee, Hsc, College of Medicine (Class of 2021)
Virtual Medical Care With Mary Parker Johnstone
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Mary Parker Johnstone for blood pressure monitoring, cholesterol management, arthritis follow-ups — no travel to Cambridge required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about Mary Parker Johnstone
Dr. Johnstone is listed as active in the NPI registry with telehealth listed in Cambridge, MA. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (617) 665-1000.
Sourced from CMS NPPES · OIG LEIE · CMS QPP 2023 · CMS Medicare Part D · CMS Physician Comparator. See Data Methodology.
Is this your profile?
Verify credentials, update practice details, and manage telehealth.
Medical Disclaimer: NPI Telehealth is a provider directory for informational purposes only. This page does not constitute medical advice, diagnosis, or treatment recommendations. Provider data is sourced from the CMS NPPES federal registry and public Medicare datasets. NPI Telehealth does not verify clinical qualifications beyond federal records. Data may not reflect real-time availability — always contact the provider's office directly to confirm details before seeking care.
Contact Mary Parker Johnstone
Practice Location
1493 Cambridge St, Cambridge, MA 02139-1099
Mailing Address
1493 Cambridge St, Cambridge, MA 02139-1099
This is a provider directory. Contact the office directly to schedule appointments.
Related Providers