Cynthia Johnston, M.D.
NPI 1831162239 · Emergency Medicine Physician · Marathon, FL
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cynthia Johnston, M.D. is a Emergency Medicine Physician provider in Marathon, FL (NPI 1831162239).
Provider details
- NPI number
- 1831162239
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- ME94206 (FL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-08
- Last updated
- 2007-09-05
Frequently asked questions
- What is Cynthia Johnston's NPI number?
- Cynthia Johnston's National Provider Identifier (NPI) is 1831162239, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cynthia Johnston's specialty?
- Cynthia Johnston is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Cynthia Johnston located?
- Cynthia Johnston's practice location on file with NPPES is 3301 Overseas Hwy, Marathon, FL 33050-2329.
- What is Cynthia Johnston's phone number?
- The practice phone number listed in the NPPES registry for Cynthia Johnston is (305) 743-5533.
- Does Cynthia Johnston accept Medicare?
- Cynthia Johnston is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cynthia Johnston's NPI active?
- Yes — Cynthia Johnston's NPI (1831162239) is active in the NPPES registry as of the last update on 2007-09-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.