NPPES file of Aug 9, 2026

Marki J. Knox, M.D.

Obstetrics & Gynecology Physician · Santa Monica, CA

Marki J. Knox, M.D. is an obstetrics & gynecology physician with a practice address in Santa Monica, California, and NPI 1518006188, issued on Feb 6, 2007. Check the license (California G50150, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1518006188
Name
Marki J. Knox
Credential
M.D.
Primary taxonomy
Obstetrics & Gynecology Physician 207V00000X
License number
G50150 CA
Self-reported in NPPES; status is on the state search
Practice location
2121 Wilshire Blvd, Santa Monica, CA 90403
Phone
(310) 264-1777
Enumerated
Feb 6, 2007
Record last updated
Aug 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(310) 264-1787
Medicare enrollment
Enrolled (PECOS I20120518000467); may accept Medicare assignment
Medical or professional school
University Of Washington School Of Medicine, 1979
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →

Also registered at 2121 Wilshire Blvd

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Babak Baravarian, DPMPodiatrist1952310799
  2. Elizabeth Baron Cole, R.D.N., C.H.F.S.Registered Dietitian1104375385
  3. Mark Biscow, MDInternal Medicine Physician1871510354
  4. Karen Blanchard, M.D.Obstetrics & Gynecology Physician1700925401
  5. Gary Briskin, DPMPodiatrist1205943818
  6. Ryan CarterPodiatrist1003259664

Verify Marki J. Knox in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G50150    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

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46% more Medicare Part D claims than the average obstetrics & gynecology physician in 2024

241 Medicare Part D claims for 73 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.

  1. Marki Knox241
  2. Specialty average165

Most prescribed

  1. Progesterone44 claims
  2. Valacyclovir42 claims
  3. Estradiol41 claims
  4. Estradiol (Twice Weekly)24 claims
  5. Femring15 claims
  6. Yuvafem14 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.

Industry payments in 2024: $117.68

5 payments; by number, the most common kind was food and beverage; the largest payer was Hologic Sales and Service, LLC. The 21,429 providers of this specialty with any payment received $1,030.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Marki Knox$117.68
  2. Specialty average$1,030.61

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Womens Medical Group OF Santa MonicaSanta Monica, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Marki J. Knox among 5,088 obstetrics & gynecology physician records in California

Marki J. Knox, M.D. is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 48% of them.

  • NPI issued2007 · 48% of these records are older, 38% newer
  • In a Medicare fileYes · 74% of these records are
  • In the CMS Doctors and Clinicians fileYes · 53% of these records are
  • Graduated1979 · median 2004 among the 2,700 with a school on file
  • Record last updated2007 · 64% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Obstetrics & Gynecology Physician providers in California

There are 5,088 obstetrics & gynecology physician records in California.

All 5,088 in California → Every provider in Santa Monica → Obstetrics & Gynecology Physician nationwide →

The 8 obstetrics & gynecology physician records with the nearest ZIP codes

  1. Karen Blanchard, M.D.Santa Monica, CA 904031700925401
  2. Allison Leong, M.D.Santa Monica, CA 904031952440562
  3. Adel Samaan, MDSanta Monica, CA 904031386664233
  4. Shamsah Amersi, M.D.Santa Monica, CA 904041699743112
  5. Tristan Bickman, MDSanta Monica, CA 904041245253210
  6. Lawrence Bruksch, M.D.Santa Monica, CA 904041073562203
  7. Zeina Hijazi, M.DSanta Monica, CA 904041518920974
  8. Karla Iacampo, MDSanta Monica, CA 904041154339083

Common questions

What is Marki J. Knox, M.D.'s NPI number?

Marki J. Knox, M.D.'s National Provider Identifier (NPI) is 1518006188, issued on Feb 6, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Marki J. Knox, M.D. located?

The NPPES record lists a practice address at 2121 Wilshire Blvd, Santa Monica, CA, 90403. Phone: (310) 264-1777. Providers update this record themselves, so call before visiting.

How can I verify Marki J. Knox, M.D.'s license?

NPPES lists California license number G50150, 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 Marki J. Knox, M.D. prescribe under Medicare Part D?

In 2024, Marki J. Knox, M.D. had 241 Medicare Part D claims for 73 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.