NPPES file of Aug 9, 2026

Ashley Guntkowski Mast, CNM, RN

Advanced Practice Midwife · San Diego, CA

Ashley Guntkowski Mast, CNM, RN is an advanced practice midwife with a practice address in San Diego, California, and NPI 1548400567, issued on Mar 3, 2009. Check the license (California 1827, 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 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1548400567
Name
Ashley Guntkowski Mast
Credential
CNM, RN
Primary taxonomy
Advanced Practice Midwife 367A00000X
License numbers
1827 CA
9375335 FL
Self-reported in NPPES; status is on the state search
Practice location
4060 Fairmount Ave, San Diego, CA 92105
Phone
(619) 255-9155
Enumerated
Mar 3, 2009
Record last updated
Apr 6, 2020 (not updated in 6 years: call before relying on the address or phone)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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Also registered at 4060 Fairmount Ave

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

  1. Rachel Abramson, MDPediatrics Physician1588707178
  2. Sanela Adzic, PAPhysician Assistant1659127033
  3. Fay Ahmadpour, DDSDentist1528143690
  4. Linda Alarcon, MS, MFTMarriage & Family Therapist1861692337
  5. Melody Albarran-Slovin, DNP, CPNP-PC, FNP-CPediatrics Physician1740953249
  6. Diana Alvarez, MSWMental Health Counselor1013200617

Verify Ashley Guntkowski Mast 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 1827    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

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Industry payments in 2024: $82.50

2 payments; by number, the most common kind was food and beverage; the largest payer was CooperSurgical, Inc. The 3,833 providers of this specialty with any payment received $204.49 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Ashley Mast$82.50
  2. Specialty average$204.49

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

Advanced Practice Midwife providers in California

There are 1,115 advanced practice midwife records in California.

All 1,115 in California → Every provider in San Diego →

Other advanced practice midwife records in California

  1. Brie Abbe, CNMUkiah, CA1457020398
  2. La Neice Abdel-Shakur, CNMTravis Afb, CA1215098512
  3. Lauren Abrahamson, CNM, NP, MSNWalnut Creek, CA1225695869
  4. Nadia Abu-Douleh, MSN CNM WHNP-BCLa Jolla, CA1851157937
  5. Liliana Acevedo Miramontes, CNM, WHNP-BCGarden Grove, CA1760238596
  6. Patricia Achilly, CNMSan Diego, CA1932257847
  7. Deborah Acker, JD, MSN, CNM, RNSacramento, CA1750952099
  8. Marian Acquistapace, CNM/FNPSanta Cruz, CA1215488226
  9. Rachael Adair, CNM, PMHNPEureka, CA1104229483
  10. Deena Adams, CNM/NPFresno, CA1093010977

Common questions

What is Ashley Guntkowski Mast, CNM, RN's NPI number?

Ashley Guntkowski Mast, CNM, RN's National Provider Identifier (NPI) is 1548400567, issued on Mar 3, 2009. An NPI identifies a provider in billing; it is not a license.

Where is Ashley Guntkowski Mast, CNM, RN located?

The NPPES record lists a practice address at 4060 Fairmount Ave, San Diego, CA, 92105. Phone: (619) 255-9155. Providers update this record themselves, so call before visiting.

How can I verify Ashley Guntkowski Mast, CNM, RN's license?

NPPES lists California license number 1827, 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.