Crystal Michelle Shirreffs, PA-C
Physician Assistant · Harbor City, CA
Crystal Michelle Shirreffs, PA-C is a physician assistant with a practice address in Harbor City, California, and NPI 1477872596, issued on May 28, 2010. Check the license (California 20955, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Crystal Michelle Shirreffs
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 20955 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1050 Pacific Coast Hwy, Harbor City, CA 90710
- Phone
- (310) 602-7927
- Enumerated
- May 28, 2010
- Record last updated
- Nov 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20120926000216); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 1050 Pacific Coast Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Crystal Michelle Shirreffs in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 20955Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average physician assistant in 2024
73 Medicare Part D claims for 49 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 38 claims were for opioids.
Most prescribed
- Tramadol Hcl31 claims
- Ibuprofen19 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 GroupAnaheim, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Crystal Michelle Shirreffs among 14,451 physician assistant records in California
Crystal Michelle Shirreffs, PA-C is one of 14,451 physician assistant records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 27% of them.
- NPI issued2010 · 27% of these records are older, 70% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2009 · median 2018 among the 7,214 with a school on file
- Record last updated2021 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
27 physician assistant records list a practice address in Harbor City
They are 27 of the 958 NPPES records with a practice address in Harbor City, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Harbor City → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Gino Aveni, PAHarbor City, CA 907101609923226
- Diane Barnard, PAHarbor City, CA 907101871641720
- Suzanne Barrett, PAHarbor City, CA 907101760530687
- Max Brummett, PAHarbor City, CA 907101740338656
- Lynne Chambers, PHYSICIAN ASSISTANTHarbor City, CA 907101275686693
- Elizabeth Finebaum, PAHarbor City, CA 907101487702304
- Parker Greene, PAHarbor City, CA 907101043366644
- Tasona Lloyd, PAHarbor City, CA 907101851432470
Common questions
What is Crystal Michelle Shirreffs, PA-C's NPI number?
Crystal Michelle Shirreffs, PA-C's National Provider Identifier (NPI) is 1477872596, issued on May 28, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Crystal Michelle Shirreffs, PA-C located?
The NPPES record lists a practice address at 1050 Pacific Coast Hwy, Harbor City, CA, 90710. Phone: (310) 602-7927. Providers update this record themselves, so call before visiting.
How can I verify Crystal Michelle Shirreffs, PA-C's license?
NPPES lists California license number 20955, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Crystal Michelle Shirreffs, PA-C prescribe under Medicare Part D?
In 2024, Crystal Michelle Shirreffs, PA-C had 73 Medicare Part D claims for 49 beneficiaries; the average among physician assistant prescribers was 830. 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.