Dr. Jacob M. Grijnsztein, MD
- Part D claims, 2024
- 37
- Industry payments
- $173
- Affiliated sites
- 2
- Medical groups
- 2
- State license
- 1
- Practice address
- 107 Northern Blvd, Great Neck, NY 11021
- Practice phone
- Call (914) 241-1050
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Optum Medical Care, P.c.
Pediatric practice · Great Neck, New York
Find Dr. Grijnsztein's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Jacob M. Grijnsztein is a pediatrician in Mount Kisco, New York
Dr. Grijnsztein practices at Optum Medical Care, P.c. in Great Neck, New York.
Dr. Grijnsztein's NPI, 1083708390, was assigned on October 3, 2006. Dr. Grijnsztein graduated from New York University Grossman School of Medicine in 1973. Dr. Grijnsztein holds New York license 123726.
- NPI
- 1083708390NPI Registry (opens in a new tab)
- NPI enumeration date
- October 3, 2006
- NPI status
- Active
- Practice phone
- (914) 241-1050
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1973
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Jacob M. Grijnsztein practices in Great Neck and Mount Kisco
Dr. Grijnsztein's primary practice is Optum Medical Care, P.c., at 107 Northern Blvd, Great Neck, NY 11021. The practice phone is (914) 241-1050. The NPI Registry lists Dr. Grijnsztein's practice address as 110 S Bedford Rd, Mount Kisco, NY 10549.
- Optum Medical Care, P.c.Primary107 Northern Blvd, Great Neck, NY 11021Phone(914) 241-1050
- NPI Registry address110 S Bedford Rd, Mount Kisco, NY 10549 · Westchester CountyPhone(516) 487-6565
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Jacob M. Grijnsztein is affiliated with 2 sites of care and 2 medical groups
Dr. Grijnsztein's primary practice is Optum Medical Care, P.c. in Great Neck, New York. The medical group on file is CareMount Medical. Dmand AI also links Dr. Grijnsztein to 1 more group practice or clinic and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Jacob M. Grijnsztein's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Grijnsztein practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Optum Medical Care, P.c. | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Jacob M. Grijnsztein is one of 4,313 pediatricians in New York
Pediatrics is Dr. Grijnsztein's primary specialty in the NPI Registry, under taxonomy code 208000000X. Dr. Grijnsztein is licensed in New York.
Specialties and state licenses
- Pediatrics, New YorkPrimary
Pediatricians near Dr. Grijnsztein
Counts of pediatricians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Jacob M. Grijnsztein's patients have a median age of 17
Across all payers, Dmand AI patient panel data puts Dr. Grijnsztein's median patient age at 17, with 19% women.
Dr. Grijnsztein's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 17
Patient panel by sex, all payers
- Women19%
- Men81%
Source: Dmand AI Patient Panel Data
Dr. Jacob M. Grijnsztein wrote 37 Medicare Part D claims in 2024
In 2024, Dr. Grijnsztein wrote 37 Medicare Part D claims. 92% of them were for generic drugs.
Dr. Grijnsztein's Part D claims by kind of drug, 2024
- Generic34 claims92%
- Brand-name and other3 claims8%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Jacob M. Grijnsztein received $173 in industry payments from 2016 to 2022
CMS Open Payments shows 7 general payments to Dr. Grijnsztein from 5 drug and device companies from 2016 to 2022. Food and beverage make up the largest share, 100% of the total. Pfizer Inc. paid the most, $71.
General payments to Dr. Grijnsztein by program year, 2016 to 2022
Companies that paid Dr. Grijnsztein the most, 2016 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Jacob M. Grijnsztein graduated from New York University Grossman School of Medicine
Dr. Grijnsztein graduated from New York University Grossman School of Medicine in 1973.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Jacob M. Grijnsztein's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Jacob M. Grijnsztein
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Jacob M. Grijnsztein's NPI number?
Dr. Jacob M. Grijnsztein's NPI number is 1083708390. It was assigned on October 3, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Jacob M. Grijnsztein?
Dr. Jacob M. Grijnsztein is a pediatrician in Mount Kisco, New York. The primary specialty in the NPI Registry is Pediatrics Physician (taxonomy code 208000000X).
Where does Dr. Jacob M. Grijnsztein practice?
Dr. Grijnsztein practices at 107 Northern Blvd, Great Neck, NY 11021. Dr. Grijnsztein also practices at 110 S Bedford Rd, Mount Kisco, NY 10549. Dr. Grijnsztein's primary practice is Optum Medical Care, P.c. in Great Neck, New York. Dmand AI also links Dr. Grijnsztein to 1 group practice or clinic and 1 medical group.
What is Dr. Jacob M. Grijnsztein's office phone number?
The practice phone on file for Dr. Grijnsztein is (914) 241-1050.
What is Dr. Jacob M. Grijnsztein's medical license number?
Dr. Grijnsztein holds New York license 123726.
What medical group is Dr. Jacob M. Grijnsztein part of?
Dr. Grijnsztein is linked to CareMount Medical. Dmand AI links Dr. Grijnsztein to 1 more medical group.
Where did Dr. Jacob M. Grijnsztein go to medical school?
Dr. Grijnsztein graduated from New York University Grossman School of Medicine in 1973.
Has Dr. Jacob M. Grijnsztein received payments from drug or device companies?
CMS Open Payments shows $173 in general payments to Dr. Grijnsztein from 5 companies from 2016 to 2022. The largest total came from Pfizer Inc.
How long has Dr. Jacob M. Grijnsztein been practicing?
Dr. Grijnsztein graduated from medical school in 1973, 53 years ago.
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