Mark T. Grattan, MD, LLC
Mark T. Grattan, MD, LLC is a healthcare organization registered as Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Honolulu, HI, holding Type 2 (organization) NPI 1043413040 since 2007. The authorized official on file is Mark Grattan, Sole Proprietor.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1043413040 |
|---|---|
| Entity type | Organization (Type 2) |
| Legal business name | Mark T. Grattan, MD, LLC |
| Practice address | 888 S KING ST, Honolulu, HI, 96813 |
| Phone | 8085223068 |
| Enumeration date | 2007-06-07 |
| Last updated in NPPES | 2007-12-11 |
Authorized official
| Name | Mark Grattan |
|---|---|
| Title | Sole Proprietor |
| Phone | 8085223068 |
Taxonomy & classification
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 208G00000X | Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician | Primary | MD 7469 | HI |
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 06869402 | Medicaid | HI | — |
Copy-ready billing details
Provider: Mark T. Grattan, MD, LLC NPI: 1043413040 Taxonomy: 208G00000X (Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician) Address: 888 S KING ST, Honolulu, HI, 96813
Providers at this address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1497745988 | Eric Crawley | Individual | Pulmonary Disease Physician | Honolulu, HI |
| 1548242076 | Cleland Child | Individual | Internal Medicine Physician | Honolulu, HI |
| 1952385106 | Susie Chang | Individual | Ophthalmology Physician | Honolulu, HI |
| 1679559132 | Mark Flanagan | Individual | Emergency Medicine Physician | Honolulu, HI |
| 1578543286 | Jennie Sekiya | Individual | Certified Registered Nurse Anesthetist | Honolulu, HI |
| 1629058987 | Jonathan Gochu | Individual | Gastroenterology Physician | Honolulu, HI |
| 1578536454 | Straub Clinic & Hospital | Organization | Community/Retail Pharmacy | Honolulu, HI |
| 1477520120 | Poh Leng | Individual | Critical Care Medicine (Internal Medicine) Physician | Honolulu, HI |
Verify this record
Cross-check NPI 1043413040 against the authoritative CMS record: view Mark T. Grattan, MD, LLC on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
What is a Type 2 NPI?
What type of organization is Mark T. Grattan, MD, LLC?
Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2007-12-11.