NPPES file of Aug 9, 2026

James William Isherwood, LCSW

Clinical Social Worker · Clearlake, CA

James William Isherwood, LCSW is a clinical social worker with a practice address in Clearlake, California, and NPI 1861801151, issued on Aug 12, 2014. Check the license (California 128618, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.

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

NPPES recordNPPES file of Aug 9, 2026
1861801151
Name
James William Isherwood
Credential
LCSW
Primary taxonomy
Clinical Social Worker 1041C0700X
License number
128618 CA
Self-reported in NPPES; status is on the state search
Practice location
15230 Lakeshore Dr, Clearlake, CA 95422
Phone
(707) 995-4545
Enumerated
Aug 12, 2014
Record last updated
Jan 8, 2026
Medicare enrollment
Enrolled (PECOS I20250910004662); accepts Medicare assignment
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 clinical social worker records → All 36,261 in California → Look up another NPI →

Also registered at 15230 Lakeshore Dr

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

  1. Marisol AguilarCommunity Health Worker1699411603
  2. Veronica ArroyoCommunity Health Worker1730710617
  3. Pari Azari, M.D.Interventional Pain Medicine Physician1942442132
  4. Arthur Bikangaga, MDSurgery Physician1952319030
  5. Jerylyn Bohlender, LCSWClinical Social Worker1750782488
  6. Daniel Boucher, MDFamily Medicine Physician1164115549

Verify James William Isherwood in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license 128618    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
Find the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. Adventist Health Clearlake Hospital Inc.Clearlake, CA

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

James William Isherwood among 36,261 clinical social worker records in California

James William Isherwood, LCSW is one of 36,261 clinical social worker records with a practice address in California. 6% 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 45% of them.

  • NPI issued2014 · 45% of these records are older, 51% newer
  • In a Medicare fileYes · 6% of these records are
  • In the CMS Doctors and Clinicians fileYes · 11% of these records are
  • Graduated2015 · median 2012 among the 4,008 with a school on file
  • Record last updated2026 · 45% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1041C0700X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

20 clinical social worker records list a practice address in Clearlake

They are 20 of the 321 NPPES records with a practice address in Clearlake, and 36,261 clinical social worker records in California.

All 36,261 in California → Every provider in Clearlake → Clinical Social Worker nationwide →

The 8 clinical social worker records with the nearest ZIP codes

  1. Jerylyn Bohlender, LCSWClearlake, CA 954221750782488
  2. Susan Carreon, M.S.W.Clearlake, CA 954221780054080
  3. April Giambra, ASW 129549Clearlake, CA 954221346683828
  4. Terri Gonsalves, MSW, LCSWClearlake, CA 954221619238656
  5. Laurie Halversen, LCSWClearlake, CA 954221356649545
  6. Aileen Klein, LCSWClearlake, CA 954221023441912
  7. Hector Lara, M.S.W.Clearlake, CA 954221164655247
  8. Jean McNally, LCSWClearlake, CA 954221215075015

Common questions

What is James William Isherwood, LCSW's NPI number?

James William Isherwood, LCSW's National Provider Identifier (NPI) is 1861801151, issued on Aug 12, 2014. An NPI identifies a provider in billing; it is not a license.

Where is James William Isherwood, LCSW located?

The NPPES record lists a practice address at 15230 Lakeshore Dr, Clearlake, CA, 95422. Phone: (707) 995-4545. Providers update this record themselves, so call before visiting.

How can I verify James William Isherwood, LCSW's license?

NPPES lists California license number 128618, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity 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.