Dr. Ann M. Haddenhorst, MD
- Medicare services, 2022
- 1,147
- Part D claims, 2023
- 721
- Industry payments
- $14
- Affiliated sites
- 3
- Medical groups
- 3
- Practice address
- 900 E Hamilton Ave, Campbell, CA 95008
- Practice phone
- Call (469) 466-7007
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Signify Health
Campbell, California
Find Dr. Haddenhorst'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. Ann M. Haddenhorst is an internist in Campbell, California
Dr. Haddenhorst practices at Signify Health in Campbell, California.
Dr. Haddenhorst's NPI, 1235134289, was assigned on June 16, 2005. Dr. Haddenhorst graduated from University of Colorado School of Medicine, Denver in 1989. Dr. Haddenhorst holds Colorado license 41561.
- NPI
- 1235134289NPI Registry (opens in a new tab)
- NPI enumeration date
- June 16, 2005
- NPI status
- Active
- Practice phone
- (469) 466-7007
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 63
- Medical school graduation
- 1989
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Ann M. Haddenhorst practices at Signify Health in Campbell, California
Dr. Haddenhorst's primary practice is Signify Health, at 900 E Hamilton Ave, Campbell, CA 95008 in Santa Clara County. The practice phone is (469) 466-7007.
- Signify Health900 E Hamilton Ave, Campbell, CA 95008 · Santa Clara CountyPhone(469) 466-7007
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Ann M. Haddenhorst is affiliated with 4 sites of care and 3 medical groups
Dr. Haddenhorst's primary practice is Signify Health in Campbell, California. The medical group on file is Signify Health. Dmand AI also links Dr. Haddenhorst to 3 more group practices and clinics and 2 medical groups, each 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. Ann M. Haddenhorst's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Haddenhorst practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Signify Health | Available with a free account |
| +3 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Ann M. Haddenhorst is one of 16,751 internists in California
Internal medicine is Dr. Haddenhorst's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Haddenhorst is licensed in Colorado.
Specialties and state licenses
- Internal medicine, ColoradoPrimary
Internists near Dr. Haddenhorst
Counts of internists 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. Ann M. Haddenhorst billed Medicare for 1,147 services in 2022
CMS data shows 1,147 Medicare services from Dr. Haddenhorst across 10 procedure codes in 2022. Medicare paid $47,866 for them.
Dr. Haddenhorst's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Office and hospital visits
- 2021: 9452022: 74122%
- Other services
- 2021: 4412022: 31030%
- Tests and treatments
- 2021: 1202022: 9620%
Where Dr. Haddenhorst's Medicare services took place, 2022
- In an office1,13099%
- In a facility171%
Dr. Haddenhorst compared with the California median for internists, 2022
- Dr. Haddenhorst
- California median
- Medicare services
- 1,147vs 3613.2 times
- Part D claims
- 721vs 42171% above
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Haddenhorst's most billed Medicare procedure codes, 2022
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. Haddenhorst and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Ann M. Haddenhorst's patients have a median age of 76
Across all payers, Dmand AI patient panel data puts Dr. Haddenhorst's median patient age at 76, with 66% women.
Dr. Haddenhorst'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
- Women66%
- Men34%
Source: Dmand AI Patient Panel Data
Dr. Ann M. Haddenhorst wrote 721 Medicare Part D claims in 2023
In 2023, Dr. Haddenhorst wrote 721 Medicare Part D claims. They cover 27 drugs, with $15,644 in total drug cost. In 2022, CMS named 5,462 claims across 112 drugs.
Dr. Haddenhorst's most prescribed drugs by claims, 2023
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, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 5,4622023: 72187%
Drugs named by CMS: 27 in 2023, 112 in 2022.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Ann M. Haddenhorst received $14 in industry payments in 2019
CMS Open Payments shows 1 general payment to Dr. Haddenhorst from 1 drug or device company in 2019. Food and beverage make up the largest share, 100% of the total. AngioDynamics, Inc. paid the most, $14.
Companies that paid Dr. Haddenhorst the most, 2019 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Ann M. Haddenhorst graduated from University of Colorado School of Medicine, Denver
Dr. Haddenhorst graduated from University of Colorado School of Medicine, Denver in 1989.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Ann M. Haddenhorst'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) |
| 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. Ann M. Haddenhorst
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. Ann M. Haddenhorst's NPI number?
Dr. Ann M. Haddenhorst's NPI number is 1235134289. It was assigned on June 16, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Ann M. Haddenhorst?
Dr. Ann M. Haddenhorst is an internist in Campbell, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Ann M. Haddenhorst practice?
Dr. Haddenhorst practices at 900 E Hamilton Ave, Campbell, CA 95008. Dr. Haddenhorst's primary practice is Signify Health in Campbell, California. Dmand AI also links Dr. Haddenhorst to 3 group practices and clinics and 2 medical groups.
What is Dr. Ann M. Haddenhorst's office phone number?
The practice phone on file for Dr. Haddenhorst is (469) 466-7007.
What is Dr. Ann M. Haddenhorst's medical license number?
Dr. Haddenhorst holds Colorado license 41561.
What medical group is Dr. Ann M. Haddenhorst part of?
Dr. Haddenhorst is linked to Signify Health. Dmand AI links Dr. Haddenhorst to 2 more medical groups.
Does Dr. Ann M. Haddenhorst accept Medicare?
Yes. CMS data shows Dr. Haddenhorst billed Medicare for 1,147 services in 2022.
What services does Dr. Ann M. Haddenhorst bill to Medicare?
In 2022, Dr. Haddenhorst's most billed Medicare services were office visit, established patient (99214), medicare service (G0439) and office visit, established patient (99213).
Where did Dr. Ann M. Haddenhorst go to medical school?
Dr. Haddenhorst graduated from University of Colorado School of Medicine, Denver in 1989.
What drugs does Dr. Ann M. Haddenhorst prescribe most?
In 2023 Medicare Part D data, Dr. Haddenhorst's most prescribed drugs by claims were Levothyroxine Sodium, Atorvastatin Calcium and Amlodipine Besylate.
Has Dr. Ann M. Haddenhorst received payments from drug or device companies?
CMS Open Payments shows $14 in general payments to Dr. Haddenhorst from 1 company from 2019 to 2019. The largest total came from AngioDynamics, Inc.
How long has Dr. Ann M. Haddenhorst been practicing?
Dr. Haddenhorst graduated from medical school in 1989, 37 years ago.
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