Active NPI
Constance B. Lentz, MD
- Internal Medicine Physician
- Amherst, MA
National Provider Identifier
1003883513
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Internal Medicine Physician
- License
- 48529
- Practice address
- 150 Infirmary Way
Amherst, MA 01003-9288 - Phone
- (413) 577-5000
- Fax
- (413) 577-5440
- NPI assigned
- Mar 2, 2006
- Sex
- Female
- 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 | 48529 | MA | Primary |
Addresses
Primary practice location
150 Infirmary Way
Amherst, MA 01003-9288
Mailing address
150 Infirmary Way
Amherst, MA 01003-9288
Phone (413) 577-5000
Other identifiers 8
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 16901 | Other | MA | HEALTH NEW ENGLAND |
| 485296 | Other | MA | CONNECTICARE |
| 048529 | Other | MA | TUFTS |
| 5780131006 | Other | MA | CIGNA |
| 1130365 | Other | MA | AETNA |
| 187697 | Other | MA | HEALTHSOURCE |
| 690002 | Other | MA | HARVARD PILGRIM |
| N51786 | Other | MA | BCBSMA |
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)
- Not enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 48529 | MA | MD | Internal Medicine Physician |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1141257600000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783900800000",
"number": "1003883513",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "150 INFIRMARY WAY",
"city": "AMHERST",
"state": "MA",
"postal_code": "010039288",
"telephone_number": "413-577-5000",
"fax_number": "413-577-5440"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "150 INFIRMARY WAY",
"city": "AMHERST",
"state": "MA",
"postal_code": "010039288",
"telephone_number": "413-577-5000",
"fax_number": "413-577-5440"
}
],
"practiceLocations": [],
"basic": {
"last_name": "LENTZ",
"first_name": "CONSTANCE",
"middle_name": "B.",
"credential": "MD",
"sole_proprietor": "NO",
"sex": "F",
"enumeration_date": "2006-03-02",
"last_updated": "2026-07-13",
"status": "A"
},
"taxonomies": [
{
"code": "207R00000X",
"taxonomy_group": "",
"desc": "Internal Medicine",
"state": "MA",
"license": "48529",
"primary": true
}
],
"identifiers": [
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "HEALTH NEW ENGLAND",
"identifier": "16901",
"state": "MA"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "CONNECTICARE",
"identifier": "485296",
"state": "MA"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "TUFTS",
"identifier": "048529",
"state": "MA"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "CIGNA",
"identifier": "5780131006",
"state": "MA"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "AETNA",
"identifier": "1130365",
"state": "MA"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "HEALTHSOURCE",
"identifier": "187697",
"state": "MA"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "HARVARD PILGRIM",
"identifier": "690002",
"state": "MA"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "BCBSMA",
"identifier": "N51786",
"state": "MA"
}
],
"endpoints": [],
"other_names": []
}Other providers in Amherst, 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.