Dr. Patti A. Hamernik, MD
- Industry payments
- $64
- Affiliated sites
- 4
- Medical groups
- 2
- Insurance carriers
- 9
- State licenses
- 3
- Practice address
- 3605 Hospital Road, Atwater, CA 95301
- Practice phone
- Call (209) 726-1235
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Castle Family Health Centers
FQHC Look-Alike (No Federal Grant) · Atwater, California
Find Dr. Hamernik'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. Patti A. Hamernik is a pediatrician in Atwater, California
Dr. Hamernik practices at Castle Family Health Centers in Atwater, California.
Dr. Hamernik's NPI, 1043238454, was assigned on July 17, 2006. Dr. Hamernik graduated from Jacobs School of Medicine and Biomedical Sciences in 1996. Dr. Hamernik holds California license C54751.
- NPI
- 1043238454NPI Registry (opens in a new tab)
- NPI enumeration date
- July 17, 2006
- NPI status
- Active
- Practice phone
- (209) 726-1235
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Medical school graduation
- 1996
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Patti A. Hamernik practices at Castle Family Health Centers in Atwater, California
Dr. Hamernik's primary practice is Castle Family Health Centers, at 3605 Hospital Road, Atwater, CA 95301 in Merced County. The practice phone is (209) 726-1235.
- Castle Family Health Centers3605 Hospital Road, Atwater, CA 95301 · Merced CountyPhone(209) 726-1235
Source: Dmand AI Affiliation Data
Dr. Patti A. Hamernik is affiliated with 4 sites of care and 2 medical groups
Dr. Hamernik's primary practice is Castle Family Health Centers in Atwater, California. The medical group on file is Castle Family Health Centers. Dmand AI also links Dr. Hamernik to 1 more breast imaging center, 1 community health center, 1 urgent care center and 1 medical group, each named with a free account. Dr. Hamernik's employer is on file too: a community health center (fqhc).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Patti A. Hamernik's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hamernik practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Castle Family Health Centers | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Patti A. Hamernik is one of 8,236 pediatricians in California
Pediatrics is Dr. Hamernik's primary specialty in the NPI Registry, under taxonomy code 208000000X. Dr. Hamernik is board certified in pediatrics by the American Board of Pediatrics. Dmand AI has Dr. Hamernik's licenses on file in 3 states: California, Ohio and Wisconsin.
Specialties and state licenses
- Pediatrics, CaliforniaPrimary
- Ohio license
- Wisconsin license
Clinical focus
Dmand AI lists conjunctivitis, joint pain and muscle pain, fibromyalgia, and limb pain among the conditions Dr. Hamernik treats.
Pediatricians near Dr. Hamernik
Counts of pediatricians 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. Patti A. Hamernik's patients have a median age of 11
Across all payers, Dmand AI patient panel data puts Dr. Hamernik's median patient age at 11, with 56% women.
Dr. Hamernik's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 11
Patient panel by sex, all payers
- Women56%
- Men44%
Source: Dmand AI Patient Panel Data
Dr. Patti A. Hamernik received $64 in industry payments from 2016 to 2025
CMS Open Payments shows 3 general payments to Dr. Hamernik from 3 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Exact Sciences Corporation paid the most, $33.
General payments to Dr. Hamernik by program year, 2016 to 2025
Companies that paid Dr. Hamernik 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. Patti A. Hamernik has 1 award and honors on record
Dmand AI lists 1 award for Dr. Hamernik.
Awards and honors for Dr. Hamernik
- Undated
- AAP Fellow
Source: Dmand AI Professional Profile Data
Dr. Patti A. Hamernik graduated from Jacobs School of Medicine and Biomedical Sciences
Dr. Hamernik graduated from Jacobs School of Medicine and Biomedical Sciences in 1996. Dr. Hamernik is a member of AAP.
- Medical school
- Board certified in pediatrics
Source: Dmand AI Professional Profile Data
Dr. Patti A. Hamernik accepts plans from 9 insurance carriers
Dr. Hamernik is in network with 9 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Elevance
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- Aspirus Health Plan
- +1 more carriersWith a free account
Plan types Dr. Hamernik accepts, by number of carriers
- Medicare7
- PPO6
- POS5
- HMO4
- EPO3
Source: Dmand AI Insurance Network Data
Sources for Dr. Patti A. Hamernik'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 patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Patti A. Hamernik
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. Patti A. Hamernik's NPI number?
Dr. Patti A. Hamernik's NPI number is 1043238454. It was assigned on July 17, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Patti A. Hamernik?
Dr. Patti A. Hamernik is a pediatrician in Atwater, California. The primary specialty in the NPI Registry is Pediatrics Physician (taxonomy code 208000000X).
Where does Dr. Patti A. Hamernik practice?
Dr. Hamernik practices at 3605 Hospital Road, Atwater, CA 95301. Dr. Hamernik's primary practice is Castle Family Health Centers in Atwater, California. Dmand AI also links Dr. Hamernik to 1 breast imaging center, 1 community health center, 1 urgent care center and 1 medical group.
What is Dr. Patti A. Hamernik's office phone number?
The practice phone on file for Dr. Hamernik is (209) 726-1235.
What is Dr. Patti A. Hamernik's medical license number?
Dr. Hamernik holds California license C54751, one of the licenses on file in 3 states.
Which states has Dr. Patti A. Hamernik been licensed in?
Dmand AI has state licenses on file for Dr. Hamernik in California (2011 to 2027), Ohio (2003 to 2012) and Wisconsin (1999 to 2003).
What medical group is Dr. Patti A. Hamernik part of?
Dr. Hamernik is linked to Castle Family Health Centers. Dmand AI links Dr. Hamernik to 1 more medical group.
Is Dr. Patti A. Hamernik board certified?
Yes. Dr. Hamernik is board certified in pediatrics by the American Board of Pediatrics.
Where did Dr. Patti A. Hamernik go to medical school?
Dr. Hamernik graduated from Jacobs School of Medicine and Biomedical Sciences in 1996.
Has Dr. Patti A. Hamernik received payments from drug or device companies?
CMS Open Payments shows $64 in general payments to Dr. Hamernik from 3 companies from 2016 to 2025. The largest total came from Exact Sciences Corporation.
How long has Dr. Patti A. Hamernik been practicing?
Dr. Hamernik graduated from medical school in 1996, 30 years ago.
What insurance does Dr. Patti A. Hamernik accept?
Dr. Hamernik is in network with 9 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
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