Dr. Donald Gustave Ammerman, MD
- Medicare services, 2024
- 598
- Medicare patients, 2024
- 48
- Part D claims, 2024
- 889
- Industry payments
- $1.7M
- Affiliated sites
- 1
- Practice address
- 84 Hospital Ave, Danbury, CT 06810
- Practice phone
- Call (203) 792-0400
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Contemporary Care
Danbury, Connecticut
Find Dr. Ammerman'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. Donald Gustave Ammerman is a psychiatrist in Danbury, Connecticut
Dr. Ammerman practices at Contemporary Care in Danbury, Connecticut.
Dr. Ammerman's NPI, 1316032295, was assigned on October 4, 2006. Dr. Ammerman graduated from University of Connecticut in 2005. Dr. Ammerman holds Connecticut license 047925.
- NPI
- 1316032295NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0143368654
- NPI enumeration date
- October 4, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (203) 792-0400
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Donald Gustave Ammerman practices at Contemporary Care in Danbury, Connecticut
Dr. Ammerman's primary practice is Contemporary Care, at 84 Hospital Ave, Danbury, CT 06810 in Western Ct County. The practice phone is (203) 792-0400.
- Contemporary Care84 Hospital Ave, Danbury, CT 06810 · Western Ct CountyPhone(203) 792-0400
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Donald Gustave Ammerman is affiliated with 2 sites of care and 1 medical group
Dr. Ammerman's primary practice is Contemporary Care in Danbury, Connecticut. The medical group on file is Contemporary Care. Dmand AI also links Dr. Ammerman to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Donald Gustave Ammerman's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ammerman practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Contemporary Care | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Donald Gustave Ammerman is one of 828 psychiatrists in Connecticut
Psychiatry is Dr. Ammerman's primary specialty in the NPI Registry, under taxonomy code 2084P0800X. Dmand AI has Dr. Ammerman's licenses on file in 2 states: Connecticut and New Hampshire.
Specialties and state licenses
- Psychiatry, ConnecticutPrimary
- New Hampshire license
Psychiatrists near Dr. Ammerman
Counts of psychiatrists 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. Donald Gustave Ammerman billed Medicare for 598 services in 2024
CMS data shows 598 Medicare services from Dr. Ammerman across 2 procedure codes in 2024, for 48 Medicare patients. Medicare paid $38,579 for them. Every service was in an office.
Dr. Ammerman's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2892024: 31810%
- Tests and treatments
- 2023: 2472024: 28013%
Dr. Ammerman compared with the Connecticut median for psychiatrists, 2024
- Dr. Ammerman
- Connecticut median
- Medicare services
- 598vs 1115.4 times
- Medicare patients
- 48vs 4020% above
- Part D claims
- 760vs 1425.4 times
Medians across 886 psychiatrists in Connecticut with Dmand AI profiles that report each measure.
Dr. Ammerman'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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ammerman and other psychiatrists in Connecticut.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Donald Gustave Ammerman treated 48 Medicare patients in 2024, average age 66
CMS counts 48 Medicare patients who saw Dr. Ammerman in 2024. The largest group is 65 to 74, with 19 patients. 75% of them have anxiety, and 75% have mood disorders. 33% are also on Medicaid. Their average risk score is 1.11, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Ammerman's median patient age at 59, with 47% women.
Dr. Ammerman's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Ammerman's Medicare patients by sex, 2024
- Women2552%
- Men2348%
Chronic conditions among Dr. Ammerman's Medicare patients, 2024
- Anxiety75%
- Mood disorders75%
- Depression73%
- High cholesterol65%
- High blood pressure63%
- Arthritis56%
- ADHD and conduct disorders33%
- Bipolar disorder29%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ammerman's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women47%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Donald Gustave Ammerman wrote 889 Medicare Part D claims in 2024
In 2024, Dr. Ammerman wrote 889 Medicare Part D claims for 81 patients. 92% of them were for generic drugs. CMS names the drug for 760 of them, across 28 drugs with 11 or more claims each, at $98,057 in total drug cost. In 2023, CMS named 878 claims across 32 drugs.
Dr. Ammerman's Part D claims by kind of drug, 2024
- Generic822 claims92%
- Brand-name67 claims8%
Dr. Ammerman's most prescribed drugs by claims, 2024
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. Ammerman's Part D claims, 2024
- Antipsychotics, patients 65 and over7%66 of 889 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, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 8782024: 76013%
Drugs named by CMS: 28 in 2024, 32 in 2023.
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. Donald Gustave Ammerman offers telehealth to Medicare patients
Dr. Ammerman accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Ammerman as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Donald Gustave Ammerman received $1,657,952 in industry payments from 2016 to 2025
CMS Open Payments shows 2,445 general payments to Dr. Ammerman from 27 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 91% of the total. Abbvie Inc. paid the most, $619,125.
General payments to Dr. Ammerman by program year, 2016 to 2025
General payments to Dr. Ammerman by kind, 2016 to 2025
- Speaker and faculty fees$1,507,72391%
- Travel and lodging$80,1625%
- Food and beverage$51,7273%
- Consulting fees$18,1891%
- Education$1510%
Companies that paid Dr. Ammerman the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Donald Gustave Ammerman graduated from University of Connecticut
Dr. Ammerman graduated from University of Connecticut in 2005.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Donald Gustave Ammerman'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 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)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) |
| 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. Donald Gustave Ammerman
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. Donald Gustave Ammerman's NPI number?
Dr. Donald Gustave Ammerman's NPI number is 1316032295. It was assigned on October 4, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Donald Gustave Ammerman?
Dr. Donald Gustave Ammerman is a psychiatrist in Danbury, Connecticut. The primary specialty in the NPI Registry is Psychiatry Physician (taxonomy code 2084P0800X).
Where does Dr. Donald Gustave Ammerman practice?
Dr. Ammerman practices at 84 Hospital Ave, Danbury, CT 06810. Dr. Ammerman's primary practice is Contemporary Care in Danbury, Connecticut. Dmand AI also links Dr. Ammerman to 1 group practice or clinic.
What is Dr. Donald Gustave Ammerman's office phone number?
The practice phone on file for Dr. Ammerman is (203) 792-0400.
What is Dr. Donald Gustave Ammerman's medical license number?
Dr. Ammerman holds Connecticut license 047925, one of the licenses on file in 2 states.
Which states has Dr. Donald Gustave Ammerman been licensed in?
Dmand AI has state licenses on file for Dr. Ammerman in Connecticut and New Hampshire.
What medical group is Dr. Donald Gustave Ammerman part of?
Dr. Ammerman is linked to Contemporary Care.
Does Dr. Donald Gustave Ammerman accept Medicare?
Yes. CMS data shows Dr. Ammerman billed Medicare for 598 services in 2024, and Dr. Ammerman accepts Medicare assignment.
Does Dr. Donald Gustave Ammerman offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Ammerman as offering telehealth services.
How many Medicare patients does Dr. Donald Gustave Ammerman see?
CMS counts 48 Medicare patients who saw Dr. Ammerman in 2024, with an average age of 66.
Show 5 more questionsShow fewer questions
What services does Dr. Donald Gustave Ammerman bill to Medicare?
In 2024, Dr. Ammerman's most billed Medicare services were office visit, established patient (99213) and psychiatric service (90833).
Where did Dr. Donald Gustave Ammerman go to medical school?
Dr. Ammerman graduated from University of Connecticut in 2005.
What drugs does Dr. Donald Gustave Ammerman prescribe most?
In 2024 Medicare Part D data, Dr. Ammerman's most prescribed drugs by claims were Bupropion XL, Trazodone HCl and Quetiapine Fumarate.
Has Dr. Donald Gustave Ammerman received payments from drug or device companies?
CMS Open Payments shows $1,657,952 in general payments to Dr. Ammerman from 27 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Donald Gustave Ammerman been practicing?
Dr. Ammerman graduated from medical school in 2005, 21 years ago.
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