Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Mark Nicholas Flanagan, DO

Individual provider Emergency Medicine Physician · NPI 1679559132

Dr. Mark Nicholas Flanagan, DO practises Emergency Medicine in Honolulu, Hawaii. Graduated from Nova Southeastern College of Osteo Medicine in 2003, 23 years ago. Practices with Straub Clinic and Hospital, a 423-clinician group and accepts Medicare assignment. Licensed in Hawaii.

Years since qualifying
23
Trained at
Nova Southeastern College of Osteo Medicine
Licensed in
HI
In the registry since
2005
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

888 S King St
Honolulu, HI 96813-3097
Phone: (808) 522-4000
Fax: (808) 522-4062
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence DOS-2253 (HI)

Record details

NPI number1679559132
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedDecember 16, 2005
Last updated in NPPESJanuary 6, 2025
Certification dateJanuary 5, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolNOVA SOUTHEASTERN COLLEGE OF OSTEO MEDICINE
Graduated 2003 (23 years in practice)
Group practice Straub Clinic And Hospital — 423 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients333
Services billed 410 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Straub Clinic and Hospital

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 423 clinicians in the practice; 12 are shown here.

Other providers in Honolulu