2026 NPPES data Obesity Medicine (Internal Medicine) Physician NPI 1891112900 DO
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CARLY ERNST, DO

Obesity Medicine (Internal Medicine) Physician in GLENDALE, Arizona. 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
400
Medicare Part D claims · 141 beneficiaries · Obesity Medicine (Internal Medicine) Physician avg: 1K

What the federal data shows

CARLY ERNST, DO filed 400 Medicare Part D claims in 2023 as a Obesity Medicine (Internal Medicine) Physician in GLENDALE, Arizona.

400
Part D claims, 2023
Likely
board-certified (heuristic)

Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) — no proprietary rating or editorial opinion is applied.

CARLY ERNST, DO's Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

400 Top 38% higher than 62% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). Below this entry. 400–600: 90,619 prescribers (7%). This entry sits in this band. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source CMS Medicare Part D Prescriber Public Use File · 2023

Board certification likely (heuristic — not verified)

CARLY ERNST, DO practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations — signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about CARLY ERNST, DO?

Quality data not reported

NPI registry status

Active

Issued 03/26/2014

NPI 1891112900

Primary specialty

Obesity Medicine (Internal Medicine) Physician

Rare

142 US NPIs in this specialty

Medicare Part D claims

400 62% vs specialty avg

2023 prescription claims

Specialty avg: 1,046

Specialty distribution in Arizona

How Obesity Medicine (Internal Medicine) Physician compares to other specialties among Arizona providers

Arizona providers

Obesity Medicine (Internal Medicine) Physician share within Arizona

1. Obesity Medicine (Internal Medicine) Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Obesity Medicine (Internal Medicine) Physician share within Arizona

Specialty board-certification context

Estimated specialty board-certified rate — Obesity Medicine (Internal Medicine) Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Obesity Medicine (Internal Medicine) Physician ABMS/AOA estimate

Est. board-certified rate (Obesity Medicine (Internal Medicine) Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Obesity Medicine (Internal Medicine) 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).

CARLY ERNST, DO appears in the CMS NPPES registry as a Obesity Medicine (Internal Medicine) Physician provider holding DO credentials at 19389 N 59TH AVE, GLENDALE, AZ, 85308, with a listed phone of (623) 537-6000. NPI 1891112900 was issued on 03/26/2014. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what ERNST 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 400 prescription claims written by this provider, covering 141 Medicare beneficiaries and totaling roughly $24K 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.

Obesity Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 142 enrolled providers across 36 states and an average of 1,046 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

19389 N 59TH AVE
GLENDALE, AZ 85308

Provider Details

NPI 1891112900
Specialty Obesity Medicine (Internal Medicine) Physician
Credentials DO
Gender Female
NPI Issued 03/26/2014

Hospital and facility affiliations

Facilities where CARLY ERNST, DO 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.

MIDWESTERN UNIVERSITY
GLENDALE, AZ
VHS OUTPATIENT CLINICS INC
SCOTTSDALE, AZ

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

Medicare Part D Prescribing Data

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

400
Total Claims
$24K
Total Drug Cost
141
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
873
Total Day Supply
23,833
Generic Drug Cost
$9K
Antibiotic Claims
48

Patient Demographics

Average Patient Age
73.2 years
Avg HCC Risk Score
1.19
Gender Split
70% female / 30% male
Age Distribution
<65: 11, 65-74: 70, 75-84: 46, 85+: 14

Top Prescribed Drugs (Medicare Part D)

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

What CARLY ERNST, DO prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Atorvastatin Calcium
28
Rosuvastatin Calcium
15
Levothyroxine Sodium
12
Lisinopril
11

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

Obesity Medicine (Internal Medicine) Physician Overview

How CARLY ERNST, DO fits within the Obesity Medicine (Internal Medicine) Physician landscape nationally.

142
Obesity Medicine (Internal Medicine) Physician Providers in US
36
States with Obesity Medicine (Internal Medicine) Physician
1,046
Avg Claims per Provider

CARLY ERNST, DO's 400 claims are below the specialty average of 1,046.

Nearby Obesity Medicine (Internal Medicine) Physician Providers in Arizona

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

Compare Obesity Medicine (Internal Medicine) Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is CARLY ERNST, DO's specialty?
CARLY ERNST, DO specializes in Obesity Medicine (Internal Medicine) Physician and practices in GLENDALE, Arizona. Credentials: DO.
How much does CARLY ERNST, DO prescribe under Medicare Part D?
In 2023, CARLY ERNST, DO wrote 400 Medicare Part D claims totaling $24K in drug costs for 141 beneficiaries.
Where is CARLY ERNST, DO located?
CARLY ERNST, DO is located at 19389 N 59TH AVE, GLENDALE, AZ, 85308. Phone: (623) 537-6000.
What is CARLY ERNST, DO's NPI number?
CARLY ERNST, DO's National Provider Identifier (NPI) is 1891112900, issued on 03/26/2014.
How many Obesity Medicine (Internal Medicine) Physician providers are there in the US?
There are 142 Obesity Medicine (Internal Medicine) Physician providers across 36 states in the US. The average Obesity Medicine (Internal Medicine) Physician provider writes 1,046 Medicare Part D claims per year.
What drugs does CARLY ERNST, DO prescribe most often?
Based on 2023 Medicare Part D data, CARLY ERNST, DO's most frequently prescribed drugs include Atorvastatin Calcium, Rosuvastatin Calcium, Levothyroxine Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does CARLY ERNST, DO accept Medicare?
CARLY ERNST, DO appears in CMS Medicare data with 400 Part D claims and 141 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify CARLY ERNST, DO's credentials?
CARLY ERNST, DO's NPI is 1891112900 with credentials DO. 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