Active NPI
Howard S Markowitz, D.D.S.
- General Practice Dentistry
- Leominster, MA
National Provider Identifier
1023079829
On this page
Key facts
NPPES NPI Registry- Primary specialty
- General Practice Dentistry
- License
- 15609
- Practice address
- 81 West St
Leominster, MA 01453-5649 - Phone
- (978) 534-9216
- Fax
- (978) 537-6931
- NPI assigned
- Mar 31, 2006
- 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 |
|---|---|---|---|---|
| General Practice Dentistry | 1223G0001X | 15609 | MA | Primary |
Addresses
Primary practice location
81 West St
Leominster, MA 01453-5649
Mailing address
81 West St
Leominster, MA 01453-5649
Phone (978) 534-9216
Other identifiers 2
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 043408210 | Other | MA | TAX ID# |
| 15609 | Other | MA | DENTAL LICENSE # |
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
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 15609 | MA | MD | General Practice Dentistry |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Howard Markowitz DDS PC | General Practice | Past | Accepting new patients |
Organizations & group practices 1
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.
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1143763200000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783900800000",
"number": "1023079829",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "81 WEST ST",
"city": "LEOMINSTER",
"state": "MA",
"postal_code": "014535649",
"telephone_number": "978-534-9216",
"fax_number": "978-537-6931"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "81 WEST ST",
"city": "LEOMINSTER",
"state": "MA",
"postal_code": "014535649",
"telephone_number": "978-534-9216",
"fax_number": "978-537-6931"
}
],
"practiceLocations": [],
"basic": {
"last_name": "MARKOWITZ",
"first_name": "HOWARD",
"middle_name": "S",
"name_prefix": "Dr.",
"credential": "D.D.S.",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2006-03-31",
"last_updated": "2026-07-13",
"status": "A"
},
"taxonomies": [
{
"code": "1223G0001X",
"taxonomy_group": "",
"desc": "Dentist, General Practice",
"state": "MA",
"license": "15609",
"primary": true
}
],
"identifiers": [
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "TAX ID#",
"identifier": "043408210",
"state": "MA"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "DENTAL LICENSE #",
"identifier": "15609",
"state": "MA"
}
],
"endpoints": [],
"other_names": []
}Other providers in Leominster, 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.