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Dr. Andrew Keyser, MD
NPI1225442023PAC ID8921375130
- Medicare services, 2019
- 16
- Part D claims, 2024
- 69
- Publications
- 2
- Affiliated sites
- 4
- Medical groups
- 9
- Practice address
- 495 Flatbush Ave, Brooklyn, NY 11225
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Cityblock Medical Practice
Brooklyn, New York
Find Dr. Keyser's professional email, personal email and mobile number
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Dr. Andrew Keyser is an emergency medicine physician in Brooklyn, New York
Dr. Keyser practices at Cityblock Medical Practice in Brooklyn, New York.
Dr. Keyser's NPI, 1225442023, was assigned on June 19, 2014. Dr. Keyser holds Arizona license R74614.
NPI and contact details
- NPI
- 1225442023NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8921375130
- NPI enumeration date
- June 19, 2014
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 38
- Medical school graduation
- 2014
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Andrew Keyser practices at Cityblock Medical Practice in Brooklyn, New York
Dr. Keyser's primary practice is Cityblock Medical Practice, at 495 Flatbush Ave, Brooklyn, NY 11225 in Kings County.
- Cityblock Medical Practice495 Flatbush Ave, Brooklyn, NY 11225 · Kings County
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Andrew Keyser is affiliated with 5 sites of care and 9 medical groups
Dr. Keyser's primary practice is Cityblock Medical Practice in Brooklyn, New York. The medical group on file is Cityblock Medical Practice. Dmand AI also links Dr. Keyser to 8 more medical groups and 4 group practices and clinics, each named with a free account.
Cityblock Medical PracticePrimary
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Andrew Keyser's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Keyser practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Cityblock Medical Practice | Available with a free account |
| +4 more sites and 8 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Andrew Keyser is one of 3,709 emergency medicine physicians in New York
Emergency medicine is Dr. Keyser's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Keyser is licensed in Arizona.
Specialties and state licenses
- Emergency medicine, ArizonaPrimary
Emergency medicine physicians near Dr. Keyser
Counts of emergency medicine physicians 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. Andrew Keyser billed Medicare for 16 services in 2019
CMS data shows 16 Medicare services from Dr. Keyser across 1 procedure code in 2019. Medicare paid $1,309 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 201916
Paid by Medicare$1,309
Procedure codes1
Dr. Keyser's Medicare services by type, 2018 to 2019
- 2018
- 2019
- Office and hospital visits
- 2018: 172019: 166%
Dr. Keyser compared with the New York median for emergency medicine physicians, 2019
- Dr. Keyser
- New York median
- Medicare services
- 16vs 21993% below
- Part D claims
- 38vs 2931% above
Medians across 3,510 emergency medicine physicians in New York with Dmand AI profiles that report each measure.
Dr. Keyser's most billed Medicare procedure codes, 2019
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Keyser and other emergency medicine physicians in New York.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Andrew Keyser's patients have a median age of 46
Across all payers, Dmand AI patient panel data puts Dr. Keyser's median patient age at 46, with 74% women.
Dr. Keyser's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 46
Patient panel by sex, all payers
- Women74%
- Men22%
Source: Dmand AI Patient Panel Data
Dr. Andrew Keyser wrote 69 Medicare Part D claims in 2024
In 2024, Dr. Keyser wrote 69 Medicare Part D claims for 61 patients. 80% of them were for generic drugs. CMS names the drug for 38 of them, across 2 drugs with 11 or more claims each, at $264 in total drug cost. In 2018, CMS named 123 claims across 7 drugs.
Part D claims, 202469
Drugs named by CMS2
Total drug cost$264
Part D patients61
Dr. Keyser's Part D claims by kind of drug, 2024
- Generic55 claims80%
- Brand-name and other14 claims20%
Dr. Keyser's most prescribed drugs by claims, 2019
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Keyser's Part D claims, 2024
- Antibiotics33%23 of 69 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2018 to 2019
- 2018
- 2019
- Claims for drugs CMS names
- 2018: 1232019: 3869%
Drugs named by CMS: 2 in 2019, 7 in 2018.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Andrew Keyser offers telehealth to Medicare patients
Dr. Keyser accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Keyser as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Andrew Keyser has 2 publications on record
Dmand AI links 2 papers to Dr. Keyser, published from 2011 to 2012. The most frequent topics are Interferon-gamma and Mice, Inbred C57BL.
Papers2
Years published2011 to 2012
Topics Dr. Keyser writes about most
- Interferon-gamma
- Mice, Inbred C57BL
Recent publications by Dr. Keyser
BCG VaccineCytokinesDisease Models, Animal
See who Dr. Keyser researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Keyser works with, so you can find a warm path to the right emergency medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Sources for Dr. Andrew Keyser'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 Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Andrew Keyser
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. Andrew Keyser's NPI number?
Dr. Andrew Keyser's NPI number is 1225442023. It was assigned on June 19, 2014, and it is active in the NPI Registry.
What kind of doctor is Dr. Andrew Keyser?
Dr. Andrew Keyser is an emergency medicine physician in Brooklyn, New York. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Andrew Keyser practice?
Dr. Keyser practices at 495 Flatbush Ave, Brooklyn, NY 11225. Dr. Keyser's primary practice is Cityblock Medical Practice in Brooklyn, New York. Dmand AI also links Dr. Keyser to 8 medical groups and 4 group practices and clinics.
What is Dr. Andrew Keyser's medical license number?
Dr. Keyser holds Arizona license R74614.
What medical group is Dr. Andrew Keyser part of?
Dr. Keyser is linked to Cityblock Medical Practice. Dmand AI links Dr. Keyser to 8 more medical groups.
Does Dr. Andrew Keyser accept Medicare?
Yes. CMS data shows Dr. Keyser billed Medicare for 16 services in 2019, and Dr. Keyser accepts Medicare assignment.
Does Dr. Andrew Keyser offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Keyser as offering telehealth services.
What services does Dr. Andrew Keyser bill to Medicare?
In 2019, Dr. Keyser's most billed Medicare services were emergency department visit (99284).
What drugs does Dr. Andrew Keyser prescribe most?
In 2019 Medicare Part D data, Dr. Keyser's most prescribed drugs by claims were Hydrocodone-Acetaminophen and Cephalexin.
How long has Dr. Andrew Keyser been practicing?
Dr. Keyser graduated from medical school in 2014, 12 years ago.
Does Dr. Andrew Keyser do research?
Dmand AI links 2 publications to Dr. Keyser, published from 2011 to 2012.
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