William Penn Croom, M.D.
Orthopaedic Surgery Physician · Lancaster, CA
William Penn Croom, M.D. is an orthopaedic surgery physician with a practice address in Lancaster, California, and NPI 1255752648, issued on Jan 2, 2014. Check the license (California A127958, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Penn Croom
- Credential
- M.D.
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- A127958 CA
Self-reported in NPPES; status is on the state search - Practice location
- 615 W Avenue L, Lancaster, CA 93534
- Phone
- (661) 951-4801
- Enumerated
- Jan 2, 2014
- Record last updated
- Dec 3, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20181112002150); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 2012
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Also registered at 615 W Avenue L
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Arad Abadi, MDVascular Surgery Physician1730673724
- Vanessa Balemagna, PHARMDPharmacist1073246294
- Jessica Barsegian, PHARM.D.Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1336517838
- Karla Basto-Herrera, PHARMDPharmacist1780150193
- John BiggsPhysical Therapist1639576101
- Juli Bolterman, RRTRegistered Respiratory Therapist1376021337
Verify William Penn Croom in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A127958Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
41% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
204 Medicare Part D claims for 87 beneficiaries, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 94 claims were for opioids.
Most prescribed
- Oxycodone-Acetaminophen69 claims
- Meloxicam57 claims
- Ondansetron Odt24 claims
- Hydrocodone-Acetaminophen18 claims
- Ibuprofen14 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 one group practice
- Southern California Permanente Medical GroupPanorama City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Penn Croom among 2,276 orthopaedic surgery physician records in California
William Penn Croom, M.D. is one of 2,276 orthopaedic surgery 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 2014, is newer than 82% of them.
- NPI issued2014 · 82% of these records are older, 16% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2012 · median 2003 among the 1,347 with a school on file
- Record last updated2021 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Orthopaedic Surgery Physician providers in California
There are 2,276 orthopaedic surgery physician records in California.
All 2,276 in California → Every provider in Lancaster → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Pierre Hendricks, MDLancaster, CA 935341720073653
- Mohamed Lameer, M.D.Lancaster, CA 935341346339801
- Eric Owashi, M.D.Lancaster, CA 935341396123857
- Min Jung Park, MD, MMSCLancaster, CA 935341700048279
- Nitin Shah, MDLancaster, CA 935341134108103
- Justin Sherfey, DOLancaster, CA 935341689786873
- Gregory Tennant, D.O.Lancaster, CA 935341073581385
- Timothy Crall, MDMammoth Lakes, CA 935461972794097
Common questions
What is William Penn Croom, M.D.'s NPI number?
William Penn Croom, M.D.'s National Provider Identifier (NPI) is 1255752648, issued on Jan 2, 2014. An NPI identifies a provider in billing; it is not a license.
Where is William Penn Croom, M.D. located?
The NPPES record lists a practice address at 615 W Avenue L, Lancaster, CA, 93534. Phone: (661) 951-4801. Providers update this record themselves, so call before visiting.
How can I verify William Penn Croom, M.D.'s license?
NPPES lists California license number A127958, 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 William Penn Croom, M.D. prescribe under Medicare Part D?
In 2024, William Penn Croom, M.D. had 204 Medicare Part D claims for 87 beneficiaries; the average among orthopaedic surgery physician prescribers was 346. 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.