Dr. John Johnstone, DO
- Part D claims, 2019
- 131
- Affiliated sites
- 2
- Medical group
- 1
- State license
- 1
- Year NPI issued
- 2006
- Practice address
- 331 Veranda ST Bldg 6, Portland, ME 04104
- Practice phone
- Call (207) 828-2424
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Martin's Point Portland Health Care Center
Mammography / Breast Imaging Center · Portland, Maine
Find Dr. Johnstone's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John Johnstone is a family medicine physician in Portland, Maine
Dr. Johnstone practices at Martin's Point Portland Health Care Center in Portland, Maine.
Dr. Johnstone's NPI, 1154377034, was assigned on May 25, 2006. Dr. Johnstone holds Maine license 1756.
- NPI
- 1154377034NPI Registry (opens in a new tab)
- NPI enumeration date
- May 25, 2006
- NPI status
- Active
- Practice phone
- (207) 828-2424
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. John Johnstone practices at Martin's Point Portland Health Care Center in Portland, Maine
Dr. Johnstone's primary practice is Martin's Point Portland Health Care Center, at 331 Veranda ST Bldg 6, Portland, ME 04104. The practice phone is (207) 828-2424.
- Martin's Point Portland Health Care Center331 Veranda ST Bldg 6, Portland, ME 04104Phone(207) 828-2424
Source: Dmand AI Affiliation Data
Dr. John Johnstone is affiliated with 2 sites of care and 1 medical group
Dr. Johnstone's primary practice is Martin's Point Portland Health Care Center in Portland, Maine. The medical group on file is Martin's Point Health Care. Dmand AI also links Dr. Johnstone to 1 more group practice or clinic, named with a free account. Dr. Johnstone's employer is on file too: a breast imaging center.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John Johnstone's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Johnstone practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Martin's Point Portland Health Care Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Johnstone is one of 991 family medicine physicians in Maine
Family medicine is Dr. Johnstone's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Johnstone is licensed in Maine.
Specialties and state licenses
- Family medicine, MainePrimary
Family medicine physicians near Dr. Johnstone
Counts of family medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John Johnstone's patients have a median age of 69
Across all payers, Dmand AI patient panel data puts Dr. Johnstone's median patient age at 69, with 22% women.
Dr. Johnstone's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women22%
- Men78%
Source: Dmand AI Patient Panel Data
Dr. John Johnstone wrote 131 Medicare Part D claims in 2019
In 2019, Dr. Johnstone wrote 131 Medicare Part D claims. Every claim was for a generic drug. They cover 8 drugs, with $1,684 in total drug cost. In 2018, CMS named 103 claims across 6 drugs.
Dr. Johnstone's most prescribed drugs by claims, 2019
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2018 to 2019
- 2018
- 2019
- Claims for drugs CMS names
- 2018: 1032019: 13127%
Drugs named by CMS: 8 in 2019, 6 in 2018.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Sources for Dr. John Johnstone's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. John Johnstone
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John Johnstone's NPI number?
Dr. John Johnstone's NPI number is 1154377034. It was assigned on May 25, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John Johnstone?
Dr. John Johnstone is a family medicine physician in Portland, Maine. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. John Johnstone practice?
Dr. Johnstone practices at 331 Veranda ST Bldg 6, Portland, ME 04104. Dr. Johnstone's primary practice is Martin's Point Portland Health Care Center in Portland, Maine. Dmand AI also links Dr. Johnstone to 1 group practice or clinic.
What is Dr. John Johnstone's office phone number?
The practice phone on file for Dr. Johnstone is (207) 828-2424.
What is Dr. John Johnstone's medical license number?
Dr. Johnstone holds Maine license 1756.
What medical group is Dr. John Johnstone part of?
Dr. Johnstone is linked to Martin's Point Health Care.
What drugs does Dr. John Johnstone prescribe most?
In 2019 Medicare Part D data, Dr. Johnstone's most prescribed drugs by claims were Amlodipine Besylate, Simvastatin and Lisinopril.
How long has Dr. John Johnstone been practicing?
Dr. Johnstone's NPI was assigned in 2006.
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