Dr. Marianne K. Ryan, MD
- Part D claims, 2024
- 45
- Hospital affiliations
- 1
- Industry payments
- $1,310
- Medical group
- 1
- Insurance carriers
- 1
- Practice address
- 25825 South Vermont Avenue, Harbor City, CA 90710
- Practice phone
- Call (310) 325-5111
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Ryan'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. Marianne K. Ryan is a general surgeon in Harbor City, California
Dr. Ryan practices at Kaiser Permanente South Bay Medical Center in Harbor City, California, part of Kaiser Permanente.
Dr. Ryan's NPI, 1336216183, was assigned on November 29, 2006. Dr. Ryan graduated from University Of Washington School Of Medicine in 1989. Dr. Ryan holds California license G70306.
- NPI
- 1336216183NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2668653577
- NPI enumeration date
- November 29, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (310) 325-5111
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 63
- Medical school graduation
- 1989
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Marianne K. Ryan practices at Kaiser Permanente South Bay Medical Center in Harbor City, California
Dr. Ryan's primary practice is Kaiser Permanente South Bay Medical Center, at 25825 South Vermont Avenue, Harbor City, CA 90710 in Los Angeles County. The practice phone is (310) 325-5111.
- Kaiser Permanente South Bay Medical Center25825 South Vermont Avenue, Harbor City, CA 90710 · Los Angeles CountyPhone(310) 325-5111
Source: Dmand AI Affiliation Data
Dr. Marianne K. Ryan is affiliated with 1 site of care and 1 medical group
Dr. Ryan's primary practice is Kaiser Permanente South Bay Medical Center in Harbor City, California, part of Kaiser Permanente. The medical group on file is Southern California Permanente Medical Group.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Marianne K. Ryan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ryan practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kaiser Permanente South Bay Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Kaiser Permanente and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Marianne K. Ryan is one of 2,926 general surgeons in California
Surgery is Dr. Ryan's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Ryan is board certified in surgery by the American Board of Surgery. Dr. Ryan is licensed in California.
Specialties and state licenses
- Surgery, CaliforniaPrimary
Clinical focus
Dmand AI lists abdominal hernia repair surgery among the conditions Dr. Ryan treats.
General surgeons near Dr. Ryan
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. Marianne K. Ryan's patients have a median age of 60
Across all payers, Dmand AI patient panel data puts Dr. Ryan's median patient age at 60, with 84% women.
Dr. Ryan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 60
Patient panel by sex, all payers
- Women84%
- Men16%
Source: Dmand AI Patient Panel Data
Dr. Marianne K. Ryan wrote 45 Medicare Part D claims in 2024
In 2024, Dr. Ryan wrote 45 Medicare Part D claims for 40 patients. 100% of them were for generic drugs. CMS names the drug for 31 of them, across 1 drug with 11 or more claims each, at $263 in total drug cost. In 2023, CMS named 34 claims across 1 drug.
Dr. Ryan'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. Ryan's Part D claims, 2024
- Opioids71%32 of 45 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: 342024: 319%
Drugs named by CMS: 1 in 2024, 1 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
How Dr. Marianne K. Ryan takes part in Medicare
Dr. Ryan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Melanoma (skin cancer) excision: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Marianne K. Ryan received $1,310 in industry payments from 2016 to 2025
CMS Open Payments shows 12 general payments to Dr. Ryan from 7 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Genentech, Inc. paid the most, $270.
General payments to Dr. Ryan by program year, 2016 to 2025
Companies that paid Dr. Ryan 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. Marianne K. Ryan has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Ryan, most recently CMS Stage 1 2012 in 2011.
Awards and honors for Dr. Ryan
- 2011
- CMS Stage 1 2012
- Undated
- ACS Fellow
Source: Dmand AI Professional Profile Data
Dr. Marianne K. Ryan graduated from University Of Washington School Of Medicine
Dr. Ryan graduated from University Of Washington School Of Medicine in 1989. Dr. Ryan is a member of ACS.
- Medical school
- Board certified in surgery
Source: Dmand AI Professional Profile Data
Dr. Marianne K. Ryan accepts plans from 1 insurance carrier
Dr. Ryan is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
- CMS Medicare
Source: Dmand AI Insurance Network Data
Sources for Dr. Marianne K. Ryan'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 |
| 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) |
| 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. Marianne K. Ryan
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. Marianne K. Ryan's NPI number?
Dr. Marianne K. Ryan's NPI number is 1336216183. It was assigned on November 29, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Marianne K. Ryan?
Dr. Marianne K. Ryan is a general surgeon in Harbor City, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Marianne K. Ryan practice?
Dr. Ryan practices at 25825 South Vermont Avenue, Harbor City, CA 90710. Dr. Ryan's primary practice is Kaiser Permanente South Bay Medical Center in Harbor City, California, part of Kaiser Permanente.
What is Dr. Marianne K. Ryan's office phone number?
The practice phone on file for Dr. Ryan is (310) 325-5111.
What is Dr. Marianne K. Ryan's medical license number?
Dr. Ryan holds California license G70306.
Which hospitals is Dr. Marianne K. Ryan affiliated with?
Dr. Ryan practices at Kaiser Permanente South Bay Medical Center in Harbor City, California.
What medical group is Dr. Marianne K. Ryan part of?
Dr. Ryan is linked to Southern California Permanente Medical Group.
Does Dr. Marianne K. Ryan accept Medicare?
Yes. CMS lists Dr. Ryan as accepting Medicare assignment.
Is Dr. Marianne K. Ryan board certified?
Yes. Dr. Ryan is board certified in surgery by the American Board of Surgery.
Where did Dr. Marianne K. Ryan go to medical school?
Dr. Ryan graduated from University Of Washington School Of Medicine in 1989.
Show 4 more questionsShow fewer questions
What drugs does Dr. Marianne K. Ryan prescribe most?
In 2024 Medicare Part D data, Dr. Ryan's most prescribed drugs by claims were Hydrocodone-Acetaminophen.
Has Dr. Marianne K. Ryan received payments from drug or device companies?
CMS Open Payments shows $1,310 in general payments to Dr. Ryan from 7 companies from 2016 to 2025. The largest total came from Genentech, Inc.
How long has Dr. Marianne K. Ryan been practicing?
Dr. Ryan graduated from medical school in 1989, 37 years ago.
What insurance does Dr. Marianne K. Ryan accept?
Dr. Ryan is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
Selling to surgery practices?
See general surgeons in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card