2026 NPPES data Nephrology Physician NPI 1639531403 M.D.
Verify on CMS →

ARIAN GOWER, M.D.

Nephrology Physician in THOUSAND OAKS, California. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
888
Medicare Part D claims · 164 beneficiaries · Nephrology Physician avg: 1K
Industry payments
$22.9K
175 payments · CMS Open Payments (Sunshine Act)
What the federal data reveals: ARIAN GOWER, M.D. is a Nephrology Physician ([object Object]) practicing in THOUSAND OAKS, California with a Medicare Part D prescribing footprint of 888 claims across 164 beneficiaries . Industry payments of $22.9K across 175 transactions are disclosed under CMS Open Payments (Sunshine Act).

What stands out: ARIAN GOWER, M.D. filed 888 Medicare Part D claims in 2023 across THOUSAND OAKS, California. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

ARIAN GOWER, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation — signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

ARIAN GOWER, M.D. at a glance

Quality data not reported

NPI registry status

Active

Issued 03/22/2016

NPI 1639531403

Primary specialty

Nephrology Physician

Mid-sized

10,534 US NPIs in this specialty

Medicare Part D claims

888 39% vs specialty avg

2023 prescription claims

Specialty avg: 1,454

Specialty distribution in California

How Nephrology Physician compares to other specialties among California providers

California providers

Nephrology Physician share within California

1. Nephrology Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Nephrology Physician share within California

Specialty board-certification context

Estimated specialty board-certified rate — Nephrology Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Nephrology Physician ABMS/AOA estimate

Est. board-certified rate (Nephrology Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Nephrology Physician) — ABMS / AOA estimate

The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.

Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).

ARIAN GOWER, M.D. is a Nephrology Physician provider practicing in THOUSAND OAKS, California, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: M.D.. NPI: 1639531403. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

ARIAN GOWER, M.D. appears in the CMS NPPES registry as a Nephrology Physician provider holding M.D. credentials at 227 W JANSS RD STE 310, THOUSAND OAKS, CA, 91360, with a listed phone of (805) 496-5800. NPI 1639531403 was issued on 03/22/2016. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what GOWER most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 888 prescription claims written by this provider, covering 164 Medicare beneficiaries and totaling roughly $360K in drug spend. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Nephrology Physician is a mid-sized specialty nationwide, with 10,534 enrolled providers across 55 states and an average of 1,454 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline. Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist — always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.

Practice Address

227 W JANSS RD STE 310
THOUSAND OAKS, CA 91360

Provider Details

NPI 1639531403
Specialty Nephrology Physician
Credentials M.D.
Gender Male
NPI Issued 03/22/2016

Hospital and facility affiliations

Facilities where ARIAN GOWER, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" — a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.

RENAL CONSULTANTS MEDICAL GROUP
THOUSAND OAKS, CA

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

Industry payments received (2024) — CMS Open Payments transparency data

The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for ARIAN GOWER, M.D.. Source: openpaymentsdata.cms.gov.

Total received

$22.9K

Largest payer

Amgen Inc.

Most common payment type

Food and Beverage

Industry payments are not necessarily indicators of bias — they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.

License & disciplinary context — California MBC 2023 annual report

Aggregate state board data only — NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 — they are NOT specific to ARIAN GOWER, M.D.. To verify ARIAN GOWER, M.D.'s current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.

576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases

MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

888
Total Claims
$360K
Total Drug Cost
164
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
2,235
Total Day Supply
66,345
Generic Drug Cost
$26K

Patient Demographics

Average Patient Age
76.4 years
Avg HCC Risk Score
2.19
Gender Split
46% female / 54% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

Drug Claims
Losartan Potassium
114
Amlodipine Besylate
95
Farxiga
Dapagliflozin Propanediol
42
Allopurinol
37
Nifedipine Er
Nifedipine
37
Chlorthalidone
35
Kerendia
Finerenone
34
Torsemide
33
Carvedilol
32
Spironolactone
32

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Nephrology Physician Overview

How ARIAN GOWER, M.D. fits within the Nephrology Physician landscape nationally.

10,534
Nephrology Physician Providers in US
55
States with Nephrology Physician
1,454
Avg Claims per Provider

ARIAN GOWER, M.D.'s 888 claims are below the specialty average of 1,454.

Nearby Nephrology Physician Providers in California

Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as GOWER.

Compare Nephrology Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is ARIAN GOWER, M.D.'s specialty?
ARIAN GOWER, M.D. specializes in Nephrology Physician and practices in THOUSAND OAKS, California. Credentials: M.D..
How much does ARIAN GOWER, M.D. prescribe under Medicare Part D?
In 2023, ARIAN GOWER, M.D. wrote 888 Medicare Part D claims totaling $360K in drug costs for 164 beneficiaries.
Where is ARIAN GOWER, M.D. located?
ARIAN GOWER, M.D. is located at 227 W JANSS RD STE 310, THOUSAND OAKS, CA, 91360. Phone: (805) 496-5800.
What is ARIAN GOWER, M.D.'s NPI number?
ARIAN GOWER, M.D.'s National Provider Identifier (NPI) is 1639531403, issued on 03/22/2016.
How many Nephrology Physician providers are there in the US?
There are 10,534 Nephrology Physician providers across 55 states in the US. The average Nephrology Physician provider writes 1,454 Medicare Part D claims per year.
What drugs does ARIAN GOWER, M.D. prescribe most often?
Based on 2023 Medicare Part D data, ARIAN GOWER, M.D.'s most frequently prescribed drugs include Losartan Potassium, Amlodipine Besylate, Farxiga. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does ARIAN GOWER, M.D. accept Medicare?
ARIAN GOWER, M.D. appears in CMS Medicare data with 888 Part D claims and 164 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify ARIAN GOWER, M.D.'s credentials?
ARIAN GOWER, M.D.'s NPI is 1639531403 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.

Data Sources

Provider Directory
CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
Specialty Classification
NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
Prescribing Data
CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
Limitations
Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.

See our complete data methodology for details on how we collect and process government data.

Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).

Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology