Dr. Wanjun S. Bae, MD
- Medicare services, 2024
- 682
- Medicare patients, 2024
- 326
- Part D claims, 2024
- 1,021
- Hospital affiliations
- 2
- Industry payments
- $21,456
- Practice address
- 27700 Medical Center Rd, Mission Viejo, CA 92691
- Practice phone
- Call (949) 365-2447
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mission Hospital - Unit
Acute Care Hospital-Unit · Mission Viejo, California
Find Dr. Bae'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. Wanjun S. Bae is a gastroenterologist in Mission Viejo, California
Dr. Bae practices at Mission Hospital - Unit in Mission Viejo, California.
Dr. Bae's NPI, 1457433906, was assigned on October 20, 2006. Dr. Bae graduated from University of Missouri School of Medicine in 2002. Dr. Bae's California license number on file is A85159.
- NPI
- 1457433906NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5698716926
- NPI enumeration date
- October 20, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (949) 365-2447
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 50
- Medical school graduation
- 2002
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Wanjun S. Bae practices at Mission Hospital - Unit in Mission Viejo, California
Dr. Bae's primary practice is Mission Hospital - Unit, at 27700 Medical Center Rd, Mission Viejo, CA 92691 in Orange County. The practice phone is (949) 365-2447.
- Mission Hospital - Unit27700 Medical Center Rd, Mission Viejo, CA 92691 · Orange CountyPhone(949) 365-2447
Source: Dmand AI Affiliation Data
Dr. Wanjun S. Bae is affiliated with 3 sites of care and 1 medical group
Dr. Bae's primary practice is Mission Hospital - Unit in Mission Viejo, California. Dr. Bae is also affiliated with Providence Mission Hospital. The medical group on file is St. Jude Heritage Medical Group. Dmand AI also links Dr. Bae to 1 more group practice or clinic, named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Wanjun S. Bae's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Bae practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mission Hospital - Unit | 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. Wanjun S. Bae is one of 1,977 gastroenterologists in California
Gastroenterology is Dr. Bae's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Bae is board certified in gastroenterology by the American Board of Internal Medicine. Dr. Bae has a license on file in California.
Specialties and state licenses
- Gastroenterology, CaliforniaPrimary
Clinical focus
Dmand AI lists acid reflux, acute gallbladder or bile duct inflammation, acute gastroduodenitis, cirrhosis of the liver, colonoscopy, gastroduodenitis, gastroenteritis and gastrointestinal bleeding among the conditions Dr. Bae treats.
Gastroenterologists near Dr. Bae
Counts of gastroenterologists 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. Wanjun S. Bae billed Medicare for 682 services in 2024
CMS data shows 682 Medicare services from Dr. Bae across 9 procedure codes in 2024, for 326 Medicare patients. Medicare paid $71,584 for them.
Dr. Bae's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 3642024: 363No change
- Office and hospital visits
- 2023: 3302024: 3193%
- Other services
- 2023: 122024: 0100%
Where Dr. Bae's Medicare services took place, 2024
- In an office31947%
- In a facility36353%
Dr. Bae compared with the California median for gastroenterologists, 2024
- Dr. Bae
- California median
- Medicare services
- 682vs 58616% above
- Medicare patients
- 326vs 3028% above
- Part D claims
- 897vs 3802.4 times
Medians across 1,875 gastroenterologists in California with Dmand AI profiles that report each measure.
Dr. Bae'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. Bae and other gastroenterologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Wanjun S. Bae treated 326 Medicare patients in 2024, average age 74
CMS counts 326 Medicare patients who saw Dr. Bae in 2024. The largest group is 65 to 74, with 167 patients. 75% of them have high cholesterol, and 70% have high blood pressure. 9% are also on Medicaid. Their average risk score is 1.20, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Bae's median patient age at 69, with 58% women.
Dr. Bae's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Bae's Medicare patients by sex, 2024
- Women18557%
- Men14143%
Chronic conditions among Dr. Bae's Medicare patients, 2024
- High cholesterol75%
- High blood pressure70%
- Arthritis44%
- Ischemic heart disease27%
- Anxiety25%
- Diabetes25%
- Mood disorders21%
- Osteoporosis21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Bae's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women58%
- Men41%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Wanjun S. Bae wrote 1,021 Medicare Part D claims in 2024
In 2024, Dr. Bae wrote 1,021 Medicare Part D claims for 488 patients. 66% of them were for generic drugs. CMS names the drug for 897 of them, across 17 drugs with 11 or more claims each, at $71,222 in total drug cost. In 2023, CMS named 762 claims across 14 drugs.
Dr. Bae's Part D claims by kind of drug, 2024
- Generic673 claims66%
- Brand-name348 claims34%
Dr. Bae'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. Bae's Part D claims, 2024
- Antibiotics2%24 of 1,021 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: 7622024: 89718%
Drugs named by CMS: 17 in 2024, 14 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. Wanjun S. Bae ranks in the 63rd percentile for upper gastrointestinal (gi) endoscopy for acid reflux in Medicare
Dr. Bae accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Bae as offering telehealth. CMS counts 50 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Bae, more than 63% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Where Dr. Bae ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 63rd percentile50 procedures
- Colonoscopy
- 53rd percentile29 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Wanjun S. Bae received $21,456 in industry payments from 2016 to 2025
CMS Open Payments shows 884 general payments to Dr. Bae from 50 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 93% of the total. Abbvie Inc. paid the most, $7,119.
General payments to Dr. Bae by program year, 2016 to 2025
General payments to Dr. Bae by kind, 2016 to 2025
- Food and beverage$19,99193%
- Travel and lodging$1,3126%
- Education$950%
- Consulting fees$580%
Companies that paid Dr. Bae 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. Wanjun S. Bae graduated from University of Missouri School of Medicine
Dr. Bae graduated from University of Missouri School of Medicine in 2002.
- Medical school
- Board certified in gastroenterology
Source: Dmand AI Professional Profile Data
Dr. Wanjun S. Bae accepts plans from 13 insurance carriers
Dr. Bae is in network with 13 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Aetna
- Elevance
- Blue Cross Blue Shield of Michigan
- United Healthcare
- HCSC
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- Alliant Health Plans
- +5 more carriersWith a free account
Plan types Dr. Bae accepts, by number of carriers
- PPO9
- Medicare8
- HMO6
- EPO4
- POS4
Source: Dmand AI Insurance Network Data
Sources for Dr. Wanjun S. Bae'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 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)Doctors and Clinicians Utilization Data (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 |
| 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. Wanjun S. Bae
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. Wanjun S. Bae's NPI number?
Dr. Wanjun S. Bae's NPI number is 1457433906. It was assigned on October 20, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Wanjun S. Bae?
Dr. Wanjun S. Bae is a gastroenterologist in Mission Viejo, California. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Wanjun S. Bae practice?
Dr. Bae practices at 27700 Medical Center Rd, Mission Viejo, CA 92691. Dr. Bae's primary practice is Mission Hospital - Unit in Mission Viejo, California. Dmand AI also links Dr. Bae to 1 group practice or clinic.
What is Dr. Wanjun S. Bae's office phone number?
The practice phone on file for Dr. Bae is (949) 365-2447.
What is Dr. Wanjun S. Bae's medical license number?
Dr. Bae's California license number on file is A85159.
Which hospitals is Dr. Wanjun S. Bae affiliated with?
Dr. Bae is affiliated with Providence Mission Hospital. Dmand AI links Dr. Bae to 1 more hospital.
What medical group is Dr. Wanjun S. Bae part of?
Dr. Bae is linked to St. Jude Heritage Medical Group.
Does Dr. Wanjun S. Bae accept Medicare?
Yes. CMS data shows Dr. Bae billed Medicare for 682 services in 2024, and Dr. Bae accepts Medicare assignment.
Does Dr. Wanjun S. Bae offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Bae as offering telehealth services.
How many Medicare patients does Dr. Wanjun S. Bae see?
CMS counts 326 Medicare patients who saw Dr. Bae in 2024, with an average age of 74.
Show 7 more questionsShow fewer questions
Is Dr. Wanjun S. Bae board certified?
Yes. Dr. Bae is board certified in gastroenterology by the American Board of Internal Medicine.
What services does Dr. Wanjun S. Bae bill to Medicare?
In 2024, Dr. Bae's most billed Medicare services were surgery: digestive system (45380), surgery: digestive system (45385) and office visit, established patient (99214).
Where did Dr. Wanjun S. Bae go to medical school?
Dr. Bae graduated from University of Missouri School of Medicine in 2002.
What drugs does Dr. Wanjun S. Bae prescribe most?
In 2024 Medicare Part D data, Dr. Bae's most prescribed drugs by claims were Pantoprazole Sodium, Plenvu and Peg 3350-Electrolyte.
Has Dr. Wanjun S. Bae received payments from drug or device companies?
CMS Open Payments shows $21,456 in general payments to Dr. Bae from 50 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Wanjun S. Bae been practicing?
Dr. Bae graduated from medical school in 2002, 24 years ago.
What insurance does Dr. Wanjun S. Bae accept?
Dr. Bae is in network with 13 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
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