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Dr. Alexander Hallac, MD
NPI1386039998PAC ID9830490010
- Medicare services, 2024
- 403
- Medicare patients, 2024
- 393
- Part D claims, 2019
- 23
- Publications
- 8
- Hospital affiliations
- 2
- Practice address
- 5 Perryridge Rd, Greenwich, CT 06830
- Practice phone
- Call (203) 863-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Hallac'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. Alexander Hallac is a hospitalist in Greenwich, Connecticut
Dr. Hallac practices at Greenwich Hospital in Greenwich, Connecticut, part of Yale New Haven Health System.
Dr. Hallac's NPI, 1386039998, was assigned on March 31, 2015. Dr. Hallac graduated from Medical University of Silesia in 2015. Dr. Hallac holds Connecticut license 64929.
NPI and contact details
- NPI
- 1386039998NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9830490010
- NPI enumeration date
- March 31, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (203) 863-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- 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)
Dr. Alexander Hallac practices at Greenwich Hospital in Greenwich, Connecticut
Dr. Hallac's primary practice is Greenwich Hospital, at 5 Perryridge Rd, Greenwich, CT 06830 in Fairfield County. The practice phone is (203) 863-3000.
- Greenwich Hospital5 Perryridge Rd, Greenwich, CT 06830 · Fairfield CountyPhone(203) 863-3000
Source: Dmand AI Affiliation Data
Dr. Alexander Hallac is affiliated with 2 sites of care and 4 medical groups
Dr. Hallac's primary practice is Greenwich Hospital in Greenwich, Connecticut, part of Yale New Haven Health System. Dr. Hallac is also affiliated with White Plains Hospital. The medical group on file is Northeast Medical Group. Dmand AI also links Dr. Hallac to 3 more medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Alexander Hallac's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hallac practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Greenwich Hospital | Available with a free account |
| +1 more site and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Alexander Hallac is one of 358 hospitalists in Connecticut
Hospitalist is Dr. Hallac's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dmand AI has Dr. Hallac's licenses on file in 2 states: Connecticut and Massachusetts.
Specialties and state licenses
- Hospitalist, ConnecticutPrimary
- Massachusetts license
Hospitalists near Dr. Hallac
Counts of hospitalists 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. Alexander Hallac billed Medicare for 403 services in 2024
CMS data shows 403 Medicare services from Dr. Hallac across 4 procedure codes in 2024, for 393 Medicare patients. Medicare paid $56,444 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 2024403
Medicare patients393
Paid by Medicare$56,444
Procedure codes4
Dr. Hallac's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4022024: 403No change
Dr. Hallac compared with the Connecticut median for hospitalists, 2024
- Dr. Hallac
- Connecticut median
- Medicare services
- 403vs 26055% above
- Medicare patients
- 393vs 1532.6 times
- Part D claims
- 23vs 8071% below
Medians across 354 hospitalists in Connecticut with Dmand AI profiles that report each measure.
Dr. Hallac's most billed Medicare procedure codes, 2024
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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Alexander Hallac treated 393 Medicare patients in 2024, average age 80
CMS counts 393 Medicare patients who saw Dr. Hallac in 2024. The largest group is 85 and over, with 154 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 26% are also on Medicaid. Their average risk score is 2.42, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Hallac's median patient age at 76, with 53% women.
Medicare patients, 2024393
Average age80
Average risk score2.42
Also on Medicaid26%
Dr. Hallac's Medicare patients by age, 2024
Dr. Hallac's Medicare patients by sex, 2024
- Women22958%
- Men16442%
Chronic conditions among Dr. Hallac's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis58%
- Ischemic heart disease48%
- Mood disorders47%
- Atrial fibrillation46%
- Anxiety44%
- Diabetes44%
Share of Medicare patients with each condition. A patient can have several.
Dr. Hallac's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 76
Patient panel by sex, all payers
- Women53%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Alexander Hallac wrote 23 Medicare Part D claims in 2019
In 2019, Dr. Hallac wrote 23 Medicare Part D claims. Every claim was for a generic drug. They cover 2 drugs, with $189 in total drug cost. In 2018, CMS named 81 claims across 4 drugs.
Part D claims, 201923
Drugs named by CMS2
Total drug cost$189
Dr. Hallac'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.
Part D claims for drugs CMS names, 2018 to 2019
- 2018
- 2019
- Claims for drugs CMS names
- 2018: 812019: 2372%
Drugs named by CMS: 2 in 2019, 4 in 2018.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
How Dr. Alexander Hallac takes part in Medicare
Dr. Hallac accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Alexander Hallac has 8 publications on record
Dmand AI links 8 papers to Dr. Hallac, published from 2013 to 2019. 2019 was the busiest year, with 3. Dr. Hallac's most frequent co-authors are Wichit Srikureja, MD, David Applebury, DO and Gareth John Morris-Stiff, BCH, MB, MD, PhD.
Papers8
Years published2013 to 2019
Dr. Hallac's papers by year, 2013 to 2019
Dr. Hallac's most frequent co-authors
- Wichit Srikureja, MD3 shared papers
- David Applebury, DO2 shared papers
- Gareth John Morris-Stiff, BCH, MB, MD, PhD2 shared papers
Recent publications by Dr. Hallac
Clin Gastroenterol Hepatol
Colonic NeoplasmsColonoscopyIncidental Findings
Acidosis, LacticColon, SigmoidComorbidity
See who Dr. Hallac researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Hallac works with, so you can find a warm path to the right hospitalists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Alexander Hallac graduated from Medical University of Silesia
Dr. Hallac graduated from Medical University of Silesia in 2015.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Alexander Hallac'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (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 |
| 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. Alexander Hallac
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. Alexander Hallac's NPI number?
Dr. Alexander Hallac's NPI number is 1386039998. It was assigned on March 31, 2015, and it is active in the NPI Registry.
What kind of doctor is Dr. Alexander Hallac?
Dr. Alexander Hallac is a hospitalist in Greenwich, Connecticut. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Alexander Hallac practice?
Dr. Hallac practices at 5 Perryridge Rd, Greenwich, CT 06830. Dr. Hallac's primary practice is Greenwich Hospital in Greenwich, Connecticut, part of Yale New Haven Health System. Dmand AI also links Dr. Hallac to 3 medical groups.
What is Dr. Alexander Hallac's office phone number?
The practice phone on file for Dr. Hallac is (203) 863-3000.
What is Dr. Alexander Hallac's medical license number?
Dr. Hallac holds Connecticut license 64929, one of the licenses on file in 2 states.
Which states has Dr. Alexander Hallac been licensed in?
Dmand AI has state licenses on file for Dr. Hallac in Connecticut and Massachusetts.
Which hospitals is Dr. Alexander Hallac affiliated with?
Dr. Hallac practices at Greenwich Hospital in Greenwich, Connecticut. Dr. Hallac is also affiliated with White Plains Hospital.
What medical group is Dr. Alexander Hallac part of?
Dr. Hallac is linked to Northeast Medical Group. Dmand AI links Dr. Hallac to 3 more medical groups.
Does Dr. Alexander Hallac accept Medicare?
Yes. CMS data shows Dr. Hallac billed Medicare for 403 services in 2024, and Dr. Hallac accepts Medicare assignment.
How many Medicare patients does Dr. Alexander Hallac see?
CMS counts 393 Medicare patients who saw Dr. Hallac in 2024, with an average age of 80.
Show 6 more questionsShow fewer questions
What services does Dr. Alexander Hallac bill to Medicare?
In 2024, Dr. Hallac's most billed Medicare services were hospital inpatient care (99223), hospital inpatient care (99222) and critical care (99291).
Where did Dr. Alexander Hallac go to medical school?
Dr. Hallac graduated from Medical University of Silesia in 2015.
What drugs does Dr. Alexander Hallac prescribe most?
In 2019 Medicare Part D data, Dr. Hallac's most prescribed drugs by claims were Amlodipine Besylate and Lisinopril.
How long has Dr. Alexander Hallac been practicing?
Dr. Hallac graduated from medical school in 2015, 11 years ago.
Does Dr. Alexander Hallac do research?
Dmand AI links 8 publications to Dr. Hallac, published from 2013 to 2019.
Who does Dr. Alexander Hallac publish with?
Dr. Hallac's most frequent co-authors are Wichit Srikureja, MD (3 shared papers), David Applebury, DO (2 shared papers) and Gareth John Morris-Stiff, BCH, MB, MD, PhD (2 shared papers).
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