Joshua Chastain Barnhill, M.D.
Pain Medicine (Anesthesiology) Physician · Laguna Hills, CA
Joshua Chastain Barnhill, M.D. is a pain medicine (anesthesiology) physician with a practice address in Laguna Hills, California, and NPI 1295020089, issued on Jun 9, 2011. Check the license (California C171227, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joshua Chastain Barnhill
- Credential
- M.D.
- Primary taxonomy
- Pain Medicine (Anesthesiology) Physician 207LP2900X
- License numbers
- C171227 CA
0101266038 VA
Self-reported in NPPES; status is on the state search - Practice location
- 23521 Paseo DE Valencia Ste 204, Laguna Hills, CA 92653
- Phone
- (949) 458-2026
- Enumerated
- Jun 9, 2011
- Record last updated
- Mar 9, 2024
- Medicare enrollment
- Enrolled (PECOS I20220714003614); accepts Medicare assignment
- Medical or professional school
- Saint Louis University School Of Medicine, 2011
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest pain medicine (anesthesiology) physician records → All 536 in California → Look up another NPI →
Also registered at 23521 Paseo DE Valencia Ste 204
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Andrew Messiha, MDPain Medicine (Anesthesiology) Physician1700018926
- Donna Muresan, P.A.-CMedical Physician Assistant1912134495
Verify Joshua Chastain Barnhill in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C171227Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
81% fewer Medicare Part D claims than the average pain medicine (anesthesiology) physician in 2024
333 Medicare Part D claims for 91 beneficiaries, against an average of 1,750 among the 2,982 providers of this specialty who prescribed in Part D. 76 claims were for opioids.
Most prescribed
- Methocarbamol67 claims
- Gabapentin53 claims
- Meloxicam44 claims
- Hydrocodone-Acetaminophen21 claims
- Tizanidine Hcl20 claims
- Tramadol Hcl17 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $926.89
27 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. The 2,789 providers of this specialty with any payment received $3,225.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 3 group practices
- Andrew H Messiha MDLaguna Hills, CA
- Faculty Physicians And Surgeons OF LlusmLoma Linda, CA
- United Medical DoctorsNewport Beach, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joshua Chastain Barnhill among 536 pain medicine (anesthesiology) physician records in California
Joshua Chastain Barnhill, M.D. is one of 536 pain medicine (anesthesiology) physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 70% of them.
- NPI issued2011 · 70% of these records are older, 26% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2011 · median 2004 among the 367 with a school on file
- Record last updated2024 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207LP2900X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pain Medicine (Anesthesiology) Physician providers in California
There are 536 pain medicine (anesthesiology) physician records in California.
All 536 in California → Every provider in Laguna Hills → Pain Medicine (Anesthesiology) Physician nationwide →
The 8 pain medicine (anesthesiology) physician records with the nearest ZIP codes
- Afshin Gerayli, M.D.Laguna Hills, CA 926531205878568
- Matthew Harris, M.D.Laguna Hills, CA 926531194951194
- Christine Lee, M.D.Laguna Hills, CA 926531689826752
- Andrew Messiha, MDLaguna Hills, CA 926531700018926
- Amir Pouradib, M.D.Laguna Hills, CA 926531326087727
- Aaron Przybysz, MDHuntington Beach, CA 926491518226232
- Arash Esmailzadegan, M.D.Huntington Beach, CA 926471740573120
- Jason Kim, MDHuntington Beach, CA 926471730683269
Common questions
What is Joshua Chastain Barnhill, M.D.'s NPI number?
Joshua Chastain Barnhill, M.D.'s National Provider Identifier (NPI) is 1295020089, issued on Jun 9, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Joshua Chastain Barnhill, M.D. located?
The NPPES record lists a practice address at 23521 Paseo DE Valencia Ste 204, Laguna Hills, CA, 92653. Phone: (949) 458-2026. Providers update this record themselves, so call before visiting.
How can I verify Joshua Chastain Barnhill, M.D.'s license?
NPPES lists California license number C171227, 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 Joshua Chastain Barnhill, M.D. prescribe under Medicare Part D?
In 2024, Joshua Chastain Barnhill, M.D. had 333 Medicare Part D claims for 91 beneficiaries; the average among pain medicine (anesthesiology) physician prescribers was 1,750. Part D covers Medicare prescriptions only.
What is Joshua Chastain Barnhill, M.D.'s MIPS final score?
The 2023 MIPS final score is 100 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.