2026 NPPES data Allergy & Immunology (Internal Medicine) Physician NPI 1629399001 M.D.
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MARK STEVENS, M.D.

Allergy & Immunology (Internal Medicine) Physician in SAINT GEORGE, Utah. 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
2K
Medicare Part D claims · 345 beneficiaries · Allergy & Immunology (Internal Medicine) Physician avg: 798
What the federal data reveals: MARK STEVENS, M.D. is a Allergy & Immunology (Internal Medicine) Physician ([object Object]) practicing in SAINT GEORGE, Utah with a Medicare Part D prescribing footprint of 2K claims across 345 beneficiaries .

What stands out: MARK STEVENS, M.D. filed 1,955 Medicare Part D claims in 2023 across SAINT GEORGE, Utah. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

MARK STEVENS, 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).

MARK STEVENS, M.D. at a glance

Quality data not reported

NPI registry status

Active

Issued 06/19/2010

NPI 1629399001

Primary specialty

Allergy & Immunology (Internal Medicine) Physician

Niche

520 US NPIs in this specialty

Medicare Part D claims

1,955 145% vs specialty avg

2023 prescription claims

Specialty avg: 798

Specialty distribution in Utah

How Allergy & Immunology (Internal Medicine) Physician compares to other specialties among Utah providers

Utah providers

Allergy & Immunology (Internal Medicine) Physician share within Utah

1. Allergy & Immunology (Internal Medicine) Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Allergy & Immunology (Internal Medicine) Physician share within Utah

Specialty board-certification context

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

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

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

0%100%78%
Est. board-certified rate (Allergy & Immunology (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).

MARK STEVENS, M.D. is a Allergy & Immunology (Internal Medicine) Physician provider practicing in SAINT GEORGE, Utah, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: M.D.. NPI: 1629399001. 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.

MARK STEVENS, M.D. appears in the CMS NPPES registry as a Allergy & Immunology (Internal Medicine) Physician provider holding M.D. credentials at 544 S 400 E, SAINT GEORGE, UT, 84770, with a listed phone of (435) 688-6288. NPI 1629399001 was issued on 06/19/2010. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what STEVENS 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 1,955 prescription claims written by this provider, covering 345 Medicare beneficiaries and totaling roughly $541K 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.

Allergy & Immunology (Internal Medicine) Physician is a narrow specialty nationwide, with 520 enrolled providers across 48 states and an average of 798 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

544 S 400 E
SAINT GEORGE, UT 84770

Provider Details

NPI 1629399001
Specialty Allergy & Immunology (Internal Medicine) Physician
Credentials M.D.
Gender Male
NPI Issued 06/19/2010

Hospital and facility affiliations

Facilities where MARK STEVENS, 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.

IHC HEALTH SERVICES INC
ST GEORGE, UT

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.

1,955
Total Claims
$541K
Total Drug Cost
345
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
3,590
Total Day Supply
102,227
Generic Drug Cost
$76K
Antibiotic Claims
37

Patient Demographics

Average Patient Age
72.0 years
Avg HCC Risk Score
1.24
Gender Split
63% female / 37% male
Age Distribution
<65: 41, 65-74: 153, 75-84: 136, 85+: 15

Top Prescribed Drugs (Medicare Part D)

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

Drug Claims
Montelukast Sodium
358
Azelastine Hcl
250
Fluticasone Propionate
202
Ipratropium Bromide
188
Albuterol Sulfate Hfa
Albuterol Sulfate
105
Famotidine
86
Omeprazole
83
Symbicort
Budesonide/Formoterol Fumarate
82
Epinephrine
55
Prednisone
45

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

Allergy & Immunology (Internal Medicine) Physician Overview

How MARK STEVENS, M.D. fits within the Allergy & Immunology (Internal Medicine) Physician landscape nationally.

520
Allergy & Immunology (Internal Medicine) Physician Providers in US
48
States with Allergy & Immunology (Internal Medicine) Physician
798
Avg Claims per Provider

MARK STEVENS, M.D.'s 1,955 claims are above the specialty average of 798.

Nearby Allergy & Immunology (Internal Medicine) Physician Providers in Utah

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

Compare Allergy & Immunology (Internal Medicine) Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is MARK STEVENS, M.D.'s specialty?
MARK STEVENS, M.D. specializes in Allergy & Immunology (Internal Medicine) Physician and practices in SAINT GEORGE, Utah. Credentials: M.D..
How much does MARK STEVENS, M.D. prescribe under Medicare Part D?
In 2023, MARK STEVENS, M.D. wrote 1,955 Medicare Part D claims totaling $541K in drug costs for 345 beneficiaries.
Where is MARK STEVENS, M.D. located?
MARK STEVENS, M.D. is located at 544 S 400 E, SAINT GEORGE, UT, 84770. Phone: (435) 688-6288.
What is MARK STEVENS, M.D.'s NPI number?
MARK STEVENS, M.D.'s National Provider Identifier (NPI) is 1629399001, issued on 06/19/2010.
How many Allergy & Immunology (Internal Medicine) Physician providers are there in the US?
There are 520 Allergy & Immunology (Internal Medicine) Physician providers across 48 states in the US. The average Allergy & Immunology (Internal Medicine) Physician provider writes 798 Medicare Part D claims per year.
What drugs does MARK STEVENS, M.D. prescribe most often?
Based on 2023 Medicare Part D data, MARK STEVENS, M.D.'s most frequently prescribed drugs include Montelukast Sodium, Azelastine Hcl, Fluticasone Propionate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does MARK STEVENS, M.D. accept Medicare?
MARK STEVENS, M.D. appears in CMS Medicare data with 1,955 Part D claims and 345 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify MARK STEVENS, M.D.'s credentials?
MARK STEVENS, M.D.'s NPI is 1629399001 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