Rolf D. Knapp, D.O
Family Medicine Physician · Orange, CA
Rolf D. Knapp, D.O is a family medicine physician with a practice address in Orange, California, and NPI 1053355982, issued on Jun 14, 2006. Check the license (California 20A5513, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Rolf D. Knapp
- Credential
- D.O
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A5513 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2540 N Santiago Blvd, Orange, CA 92867
- Phone
- (714) 921-1030
- Enumerated
- Jun 14, 2006
- Record last updated
- Nov 21, 2025
- Fax
- (714) 921-1032
- Medicare enrollment
- Enrolled (PECOS I20040714000501); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 2540 N Santiago Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rajnish Birla, MDFamily Medicine Physician1477627065
- Laura Mackenzie-Tangredi, D.O.Family Medicine Physician1679532956
Verify Rolf D. Knapp in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A5513Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
60% more Medicare Part D claims than the average family medicine physician in 2024
5,667 Medicare Part D claims for 384 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 529 claims were for opioids.
Most prescribed
- Levothyroxine Sodium279 claims
- Hydrocodone-Acetaminophen226 claims
- Atorvastatin Calcium214 claims
- Losartan Potassium160 claims
- Omeprazole142 claims
- Amlodipine Besylate118 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 2 group practices
- Centers For Family Medicine GPOrange, CA
- Healthcare Partners Affiliates Medical GroupOrange, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Rolf D. Knapp among 17,133 family medicine physician records in California
Rolf D. Knapp, D.O is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1987 · median 2005 among the 10,652 with a school on file
- Record last updated2025 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
106 family medicine physician records list a practice address in Orange
They are 106 of the 13,245 NPPES records with a practice address in Orange, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Orange → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Joey Asfahan, MDOrange, CA 928671639706211
- Rajnish Birla, MDOrange, CA 928671477627065
- James Burris, D.O.Orange, CA 928671811082415
- Salma Farukhi, MDOrange, CA 928671982966883
- Kasein Gonzalez, MDOrange, CA 928671700049459
- Christopher Holden, M.D.Orange, CA 928671306867460
- Laura Mackenzie-Tangredi, D.O.Orange, CA 928671679532956
- Sierra Moulton, D.O.Orange, CA 928671265453815
Common questions
What is Rolf D. Knapp, D.O's NPI number?
Rolf D. Knapp, D.O's National Provider Identifier (NPI) is 1053355982, issued on Jun 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Rolf D. Knapp, D.O located?
The NPPES record lists a practice address at 2540 N Santiago Blvd, Orange, CA, 92867. Phone: (714) 921-1030. Providers update this record themselves, so call before visiting.
How can I verify Rolf D. Knapp, D.O's license?
NPPES lists California license number 20A5513, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Rolf D. Knapp, D.O prescribe under Medicare Part D?
In 2024, Rolf D. Knapp, D.O had 5,667 Medicare Part D claims for 384 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.