Active NPI
Sefik Abdulhayoglu, MD
- Internal Medicine Physician
- Chelsea, MA
National Provider Identifier
1659358166
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Internal Medicine Physician
- License
- 34674
- Practice address
- 383 Washington Ave
Chelsea, MA 02150-3601 - Phone
- (618) 884-3385
- Fax
- (508) 993-8715
- NPI assigned
- Dec 27, 2005
- Sex
- Male
- Sole proprietor
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Internal Medicine Physician | 207R00000X | 34674 | MA | Primary |
Addresses
Primary practice location
383 Washington Ave
Chelsea, MA 02150-3601
Mailing address
11 Longbow Cir
Lynnfield, MA 01940-1430
Phone (508) 984-1940
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 2002892 | Medicaid | MA |
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 34674 | MA | MD | Internal Medicine Physician |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Winchester Medical Associates | Past | Accepting new patients | |
| Claimnet Medical Billing Cardiology Services | Past | Accepting new patients |
Organizations & group practices 2
Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.
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- Everett, MA
- NPI 1588646335
-
- Cardiovascular Disease Physician
- Winchester, MA
- NPI 1902888779
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1135641600000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783900800000",
"number": "1659358166",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "11 LONGBOW CIR",
"city": "LYNNFIELD",
"state": "MA",
"postal_code": "019401430",
"telephone_number": "508-984-1940",
"fax_number": "508-993-8715"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "383 WASHINGTON AVE",
"city": "CHELSEA",
"state": "MA",
"postal_code": "021503601",
"telephone_number": "618-884-3385",
"fax_number": "508-993-8715"
}
],
"practiceLocations": [],
"basic": {
"last_name": "ABDULHAYOGLU",
"first_name": "SEFIK",
"name_prefix": "Dr.",
"credential": "MD",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2005-12-27",
"last_updated": "2026-07-13",
"status": "A"
},
"taxonomies": [
{
"code": "207R00000X",
"taxonomy_group": "",
"desc": "Internal Medicine",
"state": "MA",
"license": "34674",
"primary": true
}
],
"identifiers": [
{
"code": "05",
"desc": "MEDICAID",
"issuer": null,
"identifier": "2002892",
"state": "MA"
}
],
"endpoints": [],
"other_names": []
}Other providers in Chelsea, MA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.