Am J Emerg Med
CertificationClinical CompetenceEducational Measurement
Dr. Ramon Waddell Johnson, MD
NPI1861426629
- Medicare services, 2022
- 478
- Part D claims, 2022
- 40
- Publications
- 2
- Industry payments
- $33,430
- State license
- 1
- Practice address
- 27700 Medical Center Rd, Mission Viejo, CA 92691
- Practice phone
- Call (949) 364-1400
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
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Dr. Ramon Waddell Johnson is an emergency medicine physician in Mission Viejo, California
Dr. Johnson practices in Mission Viejo, California.
Dr. Johnson's NPI, 1861426629, was assigned on July 10, 2006. Dr. Johnson graduated from Uconn School Of Medicine in 1979. Dr. Johnson holds California license G43212.
NPI and contact details
- NPI
- 1861426629NPI Registry (opens in a new tab)
- NPI enumeration date
- July 10, 2006
- NPI status
- Active
- Practice phone
- (949) 364-1400
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Ramon Waddell Johnson's practice address is in Mission Viejo, California
Dr. Johnson's practice address in the NPI Registry is 27700 Medical Center Rd, Mission Viejo, CA 92691, in Orange County. The practice phone is (949) 364-1400.
- NPI Registry address27700 Medical Center Rd, Mission Viejo, CA 92691 · Orange CountyPhone(949) 364-1400
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Ramon Waddell Johnson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Johnson practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Johnson's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Ramon Waddell Johnson is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Johnson's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Johnson is board certified in emergency medicine by the American Board of Emergency Medicine. Dr. Johnson is licensed in California.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
Emergency medicine physicians near Dr. Johnson
Counts of emergency medicine physicians 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. Ramon Waddell Johnson billed Medicare for 478 services in 2022
CMS data shows 478 Medicare services from Dr. Johnson across 6 procedure codes in 2022. Medicare paid $59,614 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 2022478
Paid by Medicare$59,614
Procedure codes6
Dr. Johnson's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Office and hospital visits
- 2021: 3762022: 3924%
- Tests and treatments
- 2021: 1502022: 8643%
Dr. Johnson compared with the California median for emergency medicine physicians, 2022
- Dr. Johnson
- California median
- Medicare services
- 478vs 26580% above
- Part D claims
- 40vs 6235% below
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Johnson'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Ramon Waddell Johnson's patients have a median age of 62
Across all payers, Dmand AI patient panel data puts Dr. Johnson's median patient age at 62, with 67% women.
Dr. Johnson's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 62
Patient panel by sex, all payers
- Women67%
- Men33%
Source: Dmand AI Patient Panel Data
Dr. Ramon Waddell Johnson wrote 40 Medicare Part D claims in 2022
In 2022, Dr. Johnson wrote 40 Medicare Part D claims. They cover 2 drugs, with $324 in total drug cost. In 2021, CMS named 30 claims across 2 drugs.
Part D claims, 202240
Drugs named by CMS2
Total drug cost$324
Dr. Johnson's most prescribed drugs by claims, 2022
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, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 302022: 4033%
Drugs named by CMS: 2 in 2022, 2 in 2021.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Ramon Waddell Johnson has 2 publications on record
Dmand AI links 2 papers to Dr. Johnson in 2018. The most frequent topics are Emergency Medicine. Dr. Johnson's most frequent co-authors are Catherine A. Marco, MD and James Thomas, DO.
Papers2
Topics Dr. Johnson writes about most
- Emergency Medicine
Dr. Johnson's most frequent co-authors
Recent publications by Dr. Johnson
Ann Emerg Med
Child Health ServicesChild WelfareClinical Protocols
See who Dr. Johnson researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Johnson works with, so you can find a warm path to the right emergency medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Ramon Waddell Johnson received $33,430 in industry payments from 2019 to 2025
CMS Open Payments shows 73 general payments to Dr. Johnson from 2 drug and device companies from 2019 to 2025. Travel and lodging make up the largest share, 87% of the total. National Marrow Donor Program paid the most, $30,303.
General payments to Dr. Johnson by program year, 2019 to 2025
General payments to Dr. Johnson by kind, 2019 to 2025
$33.4Kin total
- Travel and lodging$29,16987%
- Food and beverage$2,2617%
- Honoraria$2,0006%
Companies that paid Dr. Johnson 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. Ramon Waddell Johnson has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Johnson.
Awards and honors for Dr. Johnson
- Undated
- AAP Fellow
- ACEP Fellow
Source: Dmand AI Professional Profile Data
Dr. Ramon Waddell Johnson graduated from Uconn School Of Medicine
Dr. Johnson graduated from Uconn School Of Medicine in 1979. Dr. Johnson is a member of AAP and ACEP.
- Medical school
- Board certified in emergency medicine
- Board certified in pediatrics
Source: Dmand AI Professional Profile Data
Sources for Dr. Ramon Waddell Johnson'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 |
| 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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 |
| 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. Ramon Waddell Johnson
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. Ramon Waddell Johnson's NPI number?
Dr. Ramon Waddell Johnson's NPI number is 1861426629. It was assigned on July 10, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Ramon Waddell Johnson?
Dr. Ramon Waddell Johnson is an emergency medicine physician in Mission Viejo, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Ramon Waddell Johnson practice?
Dr. Johnson practices at 27700 Medical Center Rd, Mission Viejo, CA 92691.
What is Dr. Ramon Waddell Johnson's office phone number?
The practice phone on file for Dr. Johnson is (949) 364-1400.
What is Dr. Ramon Waddell Johnson's medical license number?
Dr. Johnson holds California license G43212.
Does Dr. Ramon Waddell Johnson accept Medicare?
Yes. CMS data shows Dr. Johnson billed Medicare for 478 services in 2022.
Is Dr. Ramon Waddell Johnson board certified?
Yes. Dr. Johnson is board certified in emergency medicine by the American Board of Emergency Medicine.
What services does Dr. Ramon Waddell Johnson bill to Medicare?
In 2022, Dr. Johnson's most billed Medicare services were emergency department visit (99285), heart test or procedure (93010) and emergency department visit (99284).
Where did Dr. Ramon Waddell Johnson go to medical school?
Dr. Johnson graduated from Uconn School Of Medicine in 1979.
What drugs does Dr. Ramon Waddell Johnson prescribe most?
In 2022 Medicare Part D data, Dr. Johnson's most prescribed drugs by claims were Cephalexin and Hydrocodone-Acetaminophen.
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Has Dr. Ramon Waddell Johnson received payments from drug or device companies?
CMS Open Payments shows $33,430 in general payments to Dr. Johnson from 2 companies from 2019 to 2025. The largest total came from National Marrow Donor Program.
How long has Dr. Ramon Waddell Johnson been practicing?
Dr. Johnson graduated from medical school in 1979, 47 years ago.
Does Dr. Ramon Waddell Johnson do research?
Dmand AI links 2 publications to Dr. Johnson.
Who does Dr. Ramon Waddell Johnson publish with?
Dr. Johnson's most frequent co-authors are Catherine A. Marco, MD (1 shared paper) and James Thomas, DO (1 shared paper).
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