Dr. Ernest Mak, MD
- Medicare services, 2019
- 67
- Part D claims, 2019
- 25
- Hospital affiliations
- 1
- Medical group
- 1
- Insurance carriers
- 8
- Practice address
- 333 Mercy Avenue, Merced, CA 95340
- Practice phone
- Call (209) 564-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Mak's professional email, personal email and mobile number
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Dr. Ernest Mak is an OB-GYN in Merced, California
Dr. Mak practices at Dignity Health - Mercy Medical Center in Merced, California, part of CommonSpirit Health.
Dr. Mak's NPI, 1750489589, was assigned on September 20, 2006. Dr. Mak graduated from UCSF School of Medicine in 1972. Dr. Mak holds Arkansas license E-0301.
- NPI
- 1750489589NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7315039724
- NPI enumeration date
- September 20, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (209) 564-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 80
- Medical school graduation
- 1972
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Ernest Mak practices at Dignity Health - Mercy Medical Center in Merced, California
Dr. Mak's primary practice is Dignity Health - Mercy Medical Center, at 333 Mercy Avenue, Merced, CA 95340 in Merced County. The practice phone is (209) 564-5000.
- Dignity Health - Mercy Medical Center333 Mercy Avenue, Merced, CA 95340 · Merced CountyPhone(209) 564-5000
Source: Dmand AI Affiliation Data
Dr. Ernest Mak is affiliated with 3 sites of care and 1 medical group
Dr. Mak's primary practice is Dignity Health - Mercy Medical Center in Merced, California, part of CommonSpirit Health. The medical group on file is Ob Hospitalist Group. Dmand AI also links Dr. Mak to 1 more hospital outpatient department and 1 rural health clinic, 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. Ernest Mak's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mak practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dignity Health - Mercy Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Ernest Mak is one of 4,642 OB-GYNs in California
Obstetrics and gynecology is Dr. Mak's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Mak is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology. Dmand AI has Dr. Mak's licenses on file in 5 states: Arkansas, Arizona, California, Louisiana and Tennessee.
Specialties and state licenses
- Obstetrics and gynecology, ArkansasPrimary
- Arizona license
- California license
- Louisiana license
- Tennessee license
OB-GYNs near Dr. Mak
Counts of OB-GYNs 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. Ernest Mak billed Medicare for 67 services in 2019
CMS data shows 67 Medicare services from Dr. Mak across 2 procedure codes in 2019, all of them office visits. Medicare paid $2,880 for them. Every service was in an office.
Dr. Mak's Medicare services by type, 2018 to 2019
- 2018
- 2019
- Office and hospital visits
- 2018: 522019: 6729%
Dr. Mak compared with the California median for OB-GYNs, 2019
- Dr. Mak
- California median
- Medicare services
- 67vs 5816% above
- Part D claims
- 25vs 3529% below
Medians across 3,823 OB-GYNs in California with Dmand AI profiles that report each measure.
Dr. Mak's most billed Medicare procedure codes, 2019
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Mak?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mak and other OB-GYNs in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Ernest Mak's patients have a median age of 31
Across all payers, Dmand AI patient panel data puts Dr. Mak's median patient age at 31, with 100% women.
Dr. Mak's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 31
Patient panel by sex, all payers
- Women100%
- Men0%
Source: Dmand AI Patient Panel Data
Dr. Ernest Mak wrote 25 Medicare Part D claims in 2019
In 2019, Dr. Mak wrote 25 Medicare Part D claims. Every claim was for a generic drug. They cover 2 drugs, with $715 in total drug cost. In 2018, CMS named 39 claims across 2 drugs.
Dr. Mak'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: 392019: 2536%
Drugs named by CMS: 2 in 2019, 2 in 2018.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
How Dr. Ernest Mak takes part in Medicare
Dr. Mak 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. Ernest Mak has 1 award and honors on record
Dmand AI lists 1 award for Dr. Mak, most recently EMERITUS CLINICAL PROFESSOR OB-GYN in 1994.
Awards and honors for Dr. Mak
- 1994
- EMERITUS CLINICAL PROFESSOR OB-GYN
Source: Dmand AI Professional Profile Data
Dr. Ernest Mak graduated from UCSF School of Medicine
Dr. Mak graduated from UCSF School of Medicine in 1972.
- Medical school
- Board certified in obstetrics & gynecology
Source: Dmand AI Professional Profile Data
Dr. Ernest Mak accepts plans from 8 insurance carriers
Dr. Mak is in network with 8 carriers, including Blue Cross Blue Shield of Michigan, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- AR State Medicaid
- CMS Medicare
- GA State Medicaid
- NV State Medicaid
Plan types Dr. Mak accepts, by number of carriers
- Medicare5
- PPO4
- Medicaid3
- HMO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Ernest Mak'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 Data |
| 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) |
| 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. Ernest Mak
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. Ernest Mak's NPI number?
Dr. Ernest Mak's NPI number is 1750489589. It was assigned on September 20, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Ernest Mak?
Dr. Ernest Mak is an OB-GYN in Merced, California. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. Ernest Mak practice?
Dr. Mak practices at 333 Mercy Avenue, Merced, CA 95340. Dr. Mak's primary practice is Dignity Health - Mercy Medical Center in Merced, California, part of CommonSpirit Health. Dmand AI also links Dr. Mak to 1 hospital outpatient department and 1 rural health clinic.
What is Dr. Ernest Mak's office phone number?
The practice phone on file for Dr. Mak is (209) 564-5000.
What is Dr. Ernest Mak's medical license number?
Dr. Mak holds Arkansas license E-0301, one of the licenses on file in 5 states.
Which states has Dr. Ernest Mak been licensed in?
Dmand AI has state licenses on file for Dr. Mak in Arkansas (1994 to 2026), Arizona (2020 to 2026), California (1973 to 2025), Louisiana (1994 to 2025) and Tennessee (2006 to 2025).
Which hospitals is Dr. Ernest Mak affiliated with?
Dr. Mak practices at Dignity Health - Mercy Medical Center in Merced, California.
What medical group is Dr. Ernest Mak part of?
Dr. Mak is linked to Ob Hospitalist Group.
Does Dr. Ernest Mak accept Medicare?
Yes. CMS data shows Dr. Mak billed Medicare for 67 services in 2019, and Dr. Mak accepts Medicare assignment.
Is Dr. Ernest Mak board certified?
Yes. Dr. Mak is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology.
Show 5 more questionsShow fewer questions
What services does Dr. Ernest Mak bill to Medicare?
In 2019, Dr. Mak's most billed Medicare services were office visit, established patient (99212) and office visit, new patient (99204).
Where did Dr. Ernest Mak go to medical school?
Dr. Mak graduated from UCSF School of Medicine in 1972.
What drugs does Dr. Ernest Mak prescribe most?
In 2019 Medicare Part D data, Dr. Mak's most prescribed drugs by claims were Estradiol and Medroxyprogesterone Acetate.
How long has Dr. Ernest Mak been practicing?
Dr. Mak graduated from medical school in 1972, 54 years ago.
What insurance does Dr. Ernest Mak accept?
Dr. Mak is in network with 8 carriers, including Blue Cross Blue Shield of Michigan, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
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