Mark Grattan, M.D.
NPI 1538258173 · Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Honolulu, HI
Enrolled with Medicare as Practitioner - Thoracic Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Grattan, M.D. is a Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician provider in Honolulu, HI (NPI 1538258173).
Provider details
- NPI number
- 1538258173
- Entity type
- Individual
- Primary specialty
- Thoracic Surgery (Cardiothoracic Vascular Surgery) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD-7469 (HI)
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
19 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
- 2006-10-12
- Last updated
- 2007-12-11
Frequently asked questions
- What is Mark Grattan's NPI number?
- Mark Grattan's National Provider Identifier (NPI) is 1538258173, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Grattan's specialty?
- Mark Grattan is listed in the NPPES registry with a primary specialty of Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Grattan located?
- Mark Grattan's practice location on file with NPPES is 888 S King St, Honolulu, HI 96813-3009.
- What is Mark Grattan's phone number?
- The practice phone number listed in the NPPES registry for Mark Grattan is (808) 522-3068.
- Does Mark Grattan accept Medicare?
- Mark Grattan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Grattan's NPI active?
- Yes — Mark Grattan's NPI (1538258173) is active in the NPPES registry as of the last update on 2007-12-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.