Active NPI
Cassandra Lynne Mark, OD
- Optometrist
- Newton, MA
National Provider Identifier
1487182010
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Optometrist
- License
- 5229
- Practice address
- 42 Langley Rd
Newton, MA 02459-1918 - Phone
- (617) 431-5747
- Fax
- (617) 431-5747
- NPI assigned
- May 26, 2017
- Sex
- Female
- Sole proprietor
- Yes
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 |
|---|---|---|---|---|
| Optometrist | 152W00000X | 5229 | MA | Primary |
Addresses
Primary practice location
42 Langley Rd
Newton, MA 02459-1918
Mailing address
42 Langley Rd
Newton, MA 02459-1918
Phone (617) 431-5747
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in MA
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: No
- Hospice: Yes
Enrollment records 1
Care Compare profile
Medicare Care Compare- Specialty
- Optometry
- Education
- New England College of Optometry, 2017
- Medicare assignment
- Accepts the Medicare-approved amount as payment in full
Practice addresses (Care Compare)
42 Langley Rd
Newton, MA 02459-1918
Phone (617) 431-5747
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Cassie Mark LLC | Optometrist | Current | Accepting new patients |
| Rabkin Optometry LLC | Optometrist | Past | Accepting new patients |
| Aeg Massachusetts Professional PC | Optometrist | Past | Accepting new patients |
Locations
42 Langley Rd
Newton Center, MA 02459
Phone (617) 431-5747
Organizations & group practices 3
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.
-
- Optometrist
- Newton, MA
- NPI 1497255236
-
- Optometrist
- Andover, MA
- NPI 1952035040
-
- Optometrist
- Boston, MA
- NPI 1285376897
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1495756800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1787875200000",
"number": "1487182010",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "42 LANGLEY RD",
"city": "NEWTON",
"state": "MA",
"postal_code": "024591918",
"telephone_number": "617-431-5747",
"fax_number": "617-431-5747"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "42 LANGLEY RD",
"city": "NEWTON",
"state": "MA",
"postal_code": "024591918",
"telephone_number": "617-431-5747",
"fax_number": "617-431-5747"
}
],
"practiceLocations": [],
"basic": {
"last_name": "MARK",
"first_name": "CASSANDRA",
"middle_name": "LYNNE",
"name_prefix": "Dr.",
"credential": "OD",
"sole_proprietor": "YES",
"sex": "F",
"enumeration_date": "2017-05-26",
"last_updated": "2026-08-28",
"certification_date": "2026-08-28",
"status": "A"
},
"taxonomies": [
{
"code": "152W00000X",
"taxonomy_group": "",
"desc": "Optometrist",
"state": "MA",
"license": "5229",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Newton, MA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 28, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
- Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.