Mary Ocallaghan, DO
NPI 1558369884 · Internal Medicine Physician · Ludington, MI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Ocallaghan, DO is a Internal Medicine Physician provider in Ludington, MI (NPI 1558369884).
Provider details
- NPI number
- 1558369884
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
- License
- 5101009391 (MI)
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
- 2005-07-11
- Last updated
- 2020-07-14
- Certified
- 2020-07-14
Frequently asked questions
- What is Mary Ocallaghan's NPI number?
- Mary Ocallaghan's National Provider Identifier (NPI) is 1558369884, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Ocallaghan's specialty?
- Mary Ocallaghan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Ocallaghan located?
- Mary Ocallaghan's practice location on file with NPPES is 889 N Jebavy Dr, Ludington, MI 49431-1208.
- What is Mary Ocallaghan's phone number?
- The practice phone number listed in the NPPES registry for Mary Ocallaghan is (231) 510-6877.
- Does Mary Ocallaghan accept Medicare?
- Mary Ocallaghan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Ocallaghan's NPI active?
- Yes — Mary Ocallaghan's NPI (1558369884) is active in the NPPES registry as of the last update on 2020-07-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.