Michelle S. Grennan, PhD
- Medicare patients, 2024
- 11
- Hospital affiliations
- 1
- Medical group
- 1
- State license
- 1
- Year NPI issued
- 2017
- Practice address
- One Gustave L Levy Place, New York, NY 10029
- Practice phone
- Call (212) 241-7981
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Michelle Grennan'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.
Michelle S. Grennan is a clinical psychologist in New York, New York
Michelle Grennan practices at The Mount Sinai Hospital in New York, New York, part of Mount Sinai Health System.
Michelle Grennan's NPI, 1922544477, was assigned on January 9, 2017. Michelle Grennan holds New York license 021973.
- NPI
- 1922544477NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9931482841
- NPI enumeration date
- January 9, 2017
- NPI status
- Active
- Offers telehealth
- Yes
- Practice phone
- (212) 241-7981
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 37
- Medical school graduation
- 2015
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Michelle S. Grennan practices at 2 locations in New York, New York
Michelle Grennan's primary practice is The Mount Sinai Hospital, at One Gustave L Levy Place, New York, NY 10029 in New York County. The practice phone is (212) 241-7981. Michelle Grennan also practices at The Mount Sinai Hospital, 1 Gustave L Levy Pl, New York, NY 10029.
- The Mount Sinai HospitalPrimaryOne Gustave L Levy Place, New York, NY 10029 · New York CountyPhone(212) 241-7981
- The Mount Sinai Hospital1 Gustave L Levy Pl, New York, NY 10029 · New York CountyPhone(212) 256-2904
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Michelle S. Grennan is affiliated with 2 sites of care and 1 medical group
Michelle Grennan's primary practice is The Mount Sinai Hospital in New York, New York, part of Mount Sinai Health System. The medical group on file is EPIC Long Island. Dmand AI also links Michelle Grennan to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Michelle S. Grennan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Michelle Grennan practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| The Mount Sinai Hospital | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Mount Sinai Health System and 6.2K+ hospitals, with verified contacts in the same login.
Michelle S. Grennan is one of 1,967 clinical psychologists in New York
Clinical is Michelle Grennan's primary specialty in the NPI Registry, under taxonomy code 103TC0700X. Michelle Grennan is licensed in New York.
Specialties and state licenses
- Clinical psychologist, New YorkPrimary
Clinical psychologists near Michelle Grennan
Counts of clinical psychologists 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
Michelle S. Grennan treated 11 Medicare patients in 2024, average age 67
CMS counts 11 Medicare patients who saw Michelle Grennan in 2024. The largest group is 85 and over, with 0 patients. Their average risk score is 1.24, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Michelle Grennan's median patient age at 33, with 100% women.
Michelle Grennan's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Michelle Grennan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 33
Patient panel by sex, all payers
- Women100%
- Men0%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Michelle S. Grennan offers telehealth to Medicare patients
CMS lists Michelle Grennan as offering telehealth.
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
Sources for Michelle S. Grennan'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 DataDmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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 Michelle S. Grennan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Michelle S. Grennan's NPI number?
Michelle S. Grennan's NPI number is 1922544477. It was assigned on January 9, 2017, and it is active in the NPI Registry.
What does Michelle S. Grennan specialize in?
Michelle S. Grennan is a clinical psychologist in New York, New York. The primary specialty in the NPI Registry is Clinical Psychologist (taxonomy code 103TC0700X).
Where does Michelle S. Grennan practice?
Michelle Grennan practices at One Gustave L Levy Place, New York, NY 10029. Michelle Grennan also practices at 1 Gustave L Levy Pl, New York, NY 10029. Michelle Grennan's primary practice is The Mount Sinai Hospital in New York, New York, part of Mount Sinai Health System. Dmand AI also links Michelle Grennan to 1 group practice or clinic.
What is Michelle S. Grennan's office phone number?
The practice phone on file for Michelle Grennan is (212) 241-7981.
What is Michelle S. Grennan's medical license number?
Michelle Grennan holds New York license 021973.
Which hospitals is Michelle S. Grennan affiliated with?
Michelle Grennan practices at The Mount Sinai Hospital in New York, New York.
What medical group is Michelle S. Grennan part of?
Michelle Grennan is linked to EPIC Long Island.
Does Michelle S. Grennan offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Michelle Grennan as offering telehealth services.
How many Medicare patients does Michelle S. Grennan see?
CMS counts 11 Medicare patients who saw Michelle Grennan in 2024, with an average age of 67.
How long has Michelle S. Grennan been practicing?
Michelle Grennan graduated from medical school in 2015, 11 years ago.
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