Dr. Christopher J. Sonnenday, MD
- Medicare services, 2024
- 98
- Medicare patients, 2024
- 87
- Part D claims, 2024
- 69
- Hospital affiliations
- 1
- Industry payments
- $6,065
- Practice address
- 1500 E Medical Center Dr, Ann Arbor, MI 48109
- Practice phone
- Call (734) 936-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
University Hospital
School-Based Health Center · Ann Arbor, Michigan
Find Dr. Sonnenday'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. Christopher J. Sonnenday is a general surgeon in Ann Arbor, Michigan
Dr. Sonnenday practices at University Hospital in Ann Arbor, Michigan.
Dr. Sonnenday's NPI, 1639103740, was assigned on July 11, 2006. Dr. Sonnenday graduated from Vanderbilt University School of Medicine in 1997. Dr. Sonnenday holds Michigan license 4301088731.
- NPI
- 1639103740NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0446282487
- NPI enumeration date
- July 11, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (734) 936-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 55
- Medical school graduation
- 1997
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Christopher J. Sonnenday practices at University Hospital in Ann Arbor, Michigan
Dr. Sonnenday's primary practice is University Hospital, at 1500 E Medical Center Dr, Ann Arbor, MI 48109. The practice phone is (734) 936-4000.
- University Hospital1500 E Medical Center Dr, Ann Arbor, MI 48109Phone(734) 936-4000
Source: Dmand AI Affiliation Data
Dr. Christopher J. Sonnenday is affiliated with 2 sites of care and 1 medical group
Dr. Sonnenday's primary practice is University Hospital in Ann Arbor, Michigan. Dr. Sonnenday is also affiliated with University Hospital. The medical group on file is University of Michigan Health. Dr. Sonnenday's employer is on file too: a school & student health.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Christopher J. Sonnenday's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Sonnenday practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| University Hospital | 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. Christopher J. Sonnenday is one of 1,095 general surgeons in Michigan
Surgery is Dr. Sonnenday's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Sonnenday is licensed in Michigan.
Specialties and state licenses
- Surgery, MichiganPrimary
General surgeons near Dr. Sonnenday
Counts of general surgeons 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. Christopher J. Sonnenday billed Medicare for 98 services in 2024
CMS data shows 98 Medicare services from Dr. Sonnenday across 4 procedure codes in 2024, for 87 Medicare patients. Medicare paid $7,731 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Sonnenday's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2592024: 8766%
- Surgery
- 2023: 242024: 1154%
Dr. Sonnenday compared with the Michigan median for general surgeons, 2024
- Dr. Sonnenday
- Michigan median
- Medicare services
- 98vs 12622% below
- Medicare patients
- 87vs 10719% below
- Part D claims
- 12vs 3060% below
Medians across 1,046 general surgeons in Michigan with Dmand AI profiles that report each measure.
Dr. Sonnenday'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. Sonnenday and other general surgeons in Michigan.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Christopher J. Sonnenday treated 87 Medicare patients in 2024, average age 63
CMS counts 87 Medicare patients who saw Dr. Sonnenday in 2024. The largest group is 65 to 74, with 41 patients. 75% of them have high blood pressure, and 67% have high cholesterol. 23% are also on Medicaid. Their average risk score is 5.00, 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. Sonnenday's median patient age at 58, with 53% women.
Dr. Sonnenday's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Sonnenday's Medicare patients by sex, 2024
- Women5664%
- Men3136%
Chronic conditions among Dr. Sonnenday's Medicare patients, 2024
- High blood pressure75%
- High cholesterol67%
- Chronic kidney disease66%
- Mood disorders44%
- Diabetes41%
- Depression40%
- Anxiety38%
- Arthritis38%
Share of Medicare patients with each condition. A patient can have several.
Dr. Sonnenday's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 58
Patient panel by sex, all payers
- Women53%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Christopher J. Sonnenday wrote 69 Medicare Part D claims in 2024
In 2024, Dr. Sonnenday wrote 69 Medicare Part D claims for 27 patients. 87% of them were for generic drugs. CMS names the drug for 12 of them, across 1 drug with 11 or more claims each, at $41 in total drug cost. In 2020, CMS named 11 claims across 1 drug.
Dr. Sonnenday's Part D claims by kind of drug, 2024
- Generic60 claims87%
- Brand-name and other9 claims13%
Dr. Sonnenday's most prescribed drugs by claims, 2021
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, 2020 to 2021
- 2020
- 2021
- Claims for drugs CMS names
- 2020: 112021: 129%
Drugs named by CMS: 1 in 2021, 1 in 2020.
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. Christopher J. Sonnenday offers telehealth to Medicare patients
Dr. Sonnenday accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Sonnenday as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Christopher J. Sonnenday received $6,065 in industry payments from 2019 to 2025
CMS Open Payments shows 7 general payments to Dr. Sonnenday from 4 drug and device companies from 2019 to 2025. Travel and lodging make up the largest share, 45% of the total. TransMedics, Inc. paid the most, $2,757.
General payments to Dr. Sonnenday by program year, 2019 to 2025
General payments to Dr. Sonnenday by kind, 2019 to 2025
- Travel and lodging$2,75745%
- Honoraria$1,75029%
- Education$1,50025%
- Food and beverage$581%
Companies that paid Dr. Sonnenday the most, 2019 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Christopher J. Sonnenday graduated from Vanderbilt University School of Medicine
Dr. Sonnenday graduated from Vanderbilt University School of Medicine in 1997.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Christopher J. Sonnenday'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)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. Christopher J. Sonnenday
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. Christopher J. Sonnenday's NPI number?
Dr. Christopher J. Sonnenday's NPI number is 1639103740. It was assigned on July 11, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Christopher J. Sonnenday?
Dr. Christopher J. Sonnenday is a general surgeon in Ann Arbor, Michigan. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Christopher J. Sonnenday practice?
Dr. Sonnenday practices at 1500 E Medical Center Dr, Ann Arbor, MI 48109. Dr. Sonnenday's primary practice is University Hospital in Ann Arbor, Michigan.
What is Dr. Christopher J. Sonnenday's office phone number?
The practice phone on file for Dr. Sonnenday is (734) 936-4000.
What is Dr. Christopher J. Sonnenday's medical license number?
Dr. Sonnenday holds Michigan license 4301088731.
Which hospitals is Dr. Christopher J. Sonnenday affiliated with?
Dr. Sonnenday is affiliated with University Hospital.
What medical group is Dr. Christopher J. Sonnenday part of?
Dr. Sonnenday is linked to University of Michigan Health.
Does Dr. Christopher J. Sonnenday accept Medicare?
Yes. CMS data shows Dr. Sonnenday billed Medicare for 98 services in 2024, and Dr. Sonnenday accepts Medicare assignment.
Does Dr. Christopher J. Sonnenday offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Sonnenday as offering telehealth services.
How many Medicare patients does Dr. Christopher J. Sonnenday see?
CMS counts 87 Medicare patients who saw Dr. Sonnenday in 2024, with an average age of 63.
Show 5 more questionsShow fewer questions
What services does Dr. Christopher J. Sonnenday bill to Medicare?
In 2024, Dr. Sonnenday's most billed Medicare services were hospital inpatient care (99232), office visit, established patient (99214) and hospital inpatient care (99222).
Where did Dr. Christopher J. Sonnenday go to medical school?
Dr. Sonnenday graduated from Vanderbilt University School of Medicine in 1997.
What drugs does Dr. Christopher J. Sonnenday prescribe most?
In 2021 Medicare Part D data, Dr. Sonnenday's most prescribed drugs by claims were Prednisone.
Has Dr. Christopher J. Sonnenday received payments from drug or device companies?
CMS Open Payments shows $6,065 in general payments to Dr. Sonnenday from 4 companies from 2019 to 2025. The largest total came from TransMedics, Inc.
How long has Dr. Christopher J. Sonnenday been practicing?
Dr. Sonnenday graduated from medical school in 1997, 29 years ago.
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