2026 NPPES data Allergy & Immunology Physician NPI 1326028812 M.D.
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GERALD VOLCHECK, M.D.

Allergy & Immunology Physician in ROCHESTER, Minnesota. 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
516
Medicare Part D claims · 77 beneficiaries · Allergy & Immunology Physician avg: 764
Generic prescribing
56%
generic claims · 44% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

GERALD VOLCHECK, M.D. filed 516 Medicare Part D claims in 2023 as a Allergy & Immunology Physician in ROCHESTER, Minnesota, prescribing 56% generic.

516
Part D claims, 2023
56%
generic prescribing
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.

GERALD VOLCHECK, M.D.'s Medicare Part D volume vs every U.S. prescriber

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

516 Top 34% higher than 66% 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)

GERALD VOLCHECK, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 3 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 GERALD VOLCHECK, M.D.?

Quality data not reported

NPI registry status

Active

Issued 01/19/2006

NPI 1326028812

Primary specialty

Allergy & Immunology Physician

Niche

3,390 US NPIs in this specialty

Medicare Part D claims

516 32% vs specialty avg

2023 prescription claims

Specialty avg: 764

Specialty distribution in Minnesota

How Allergy & Immunology Physician compares to other specialties among Minnesota providers

Minnesota providers

Allergy & Immunology Physician share within Minnesota

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

Specialty board-certification context

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

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

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

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

GERALD VOLCHECK, M.D. appears in the CMS NPPES registry as a Allergy & Immunology Physician provider holding M.D. credentials at 200 1ST ST SW, ROCHESTER, MN, 55905, with a listed phone of (507) 284-2511. NPI 1326028812 was issued on 01/19/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what VOLCHECK 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 516 prescription claims written by this provider, covering 77 Medicare beneficiaries and totaling roughly $259K in drug spend, split 44% brand-name and 56% generic by claim count. 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 Physician is a narrow specialty nationwide, with 3,390 enrolled providers across 52 states and an average of 764 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

200 1ST ST SW
ROCHESTER, MN 55905

Provider Details

NPI 1326028812
Specialty Allergy & Immunology Physician
Credentials M.D.
Gender Male
NPI Issued 01/19/2006

Hospital and facility affiliations

Facilities where GERALD VOLCHECK, 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.

MAYO CLINIC
ROCHESTER, MN
MAYO CLINIC ARIZONA
SCOTTSDALE, AZ
MAYO CLINIC HEALTH SYSTEM-SOUTHEAST MINNESOTA REGION
ALBERT LEA, MN

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

Brand vs generic prescribing mix · Above average

GERALD VOLCHECK, M.D. — brand share 44.0%
Specialty average (est.)

44% brand-name claims vs 56% generic, on 516 2023 Medicare Part D claims.

The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.

Medicare Part D Prescribing Data

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

516
Total Claims
$259K
Total Drug Cost
77
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
942
Total Day Supply
26,647
Brand vs Generic
44% brand / 56% generic
Brand Drug Cost
$177K
Generic Drug Cost
$82K
Antibiotic Claims
22

Patient Demographics

Average Patient Age
72.7 years
Avg HCC Risk Score
0.86
Gender Split
45% female / 55% male

Top Prescribed Drugs (Medicare Part D)

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

What GERALD VOLCHECK, M.D. 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
Montelukast Sodium
82
Prednisone
44
Albuterol Sulfate Hfa
Albuterol Sulfate
29
Advair Hfa
Fluticasone Propion/Salmeterol
28
Breo Ellipta
Fluticasone/Vilanterol
24
Advair Diskus
Fluticasone Propion/Salmeterol
23
Sodium Chloride
Sodium Chloride Irrig Solution
23
Flovent Hfa
Fluticasone Propionate
20
Ipratropium Bromide
15
Nucala
Mepolizumab
14

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

Allergy & Immunology Physician Overview

How GERALD VOLCHECK, M.D. fits within the Allergy & Immunology Physician landscape nationally.

3,390
Allergy & Immunology Physician Providers in US
52
States with Allergy & Immunology Physician
764
Avg Claims per Provider

GERALD VOLCHECK, M.D.'s 516 claims are below the specialty average of 764.

Nearby Allergy & Immunology Physician Providers in Minnesota

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

Compare Allergy & Immunology Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is GERALD VOLCHECK, M.D.'s specialty?
GERALD VOLCHECK, M.D. specializes in Allergy & Immunology Physician and practices in ROCHESTER, Minnesota. Credentials: M.D..
How much does GERALD VOLCHECK, M.D. prescribe under Medicare Part D?
In 2023, GERALD VOLCHECK, M.D. wrote 516 Medicare Part D claims totaling $259K in drug costs for 77 beneficiaries.
Where is GERALD VOLCHECK, M.D. located?
GERALD VOLCHECK, M.D. is located at 200 1ST ST SW, ROCHESTER, MN, 55905. Phone: (507) 284-2511.
What is GERALD VOLCHECK, M.D.'s NPI number?
GERALD VOLCHECK, M.D.'s National Provider Identifier (NPI) is 1326028812, issued on 01/19/2006.
Does GERALD VOLCHECK, M.D. prescribe more brand-name or generic drugs?
GERALD VOLCHECK, M.D.'s prescribing is 44% brand-name and 56% generic drugs by claim count, with $177K in brand drug costs.
How many Allergy & Immunology Physician providers are there in the US?
There are 3,390 Allergy & Immunology Physician providers across 52 states in the US. The average Allergy & Immunology Physician provider writes 764 Medicare Part D claims per year.
What drugs does GERALD VOLCHECK, M.D. prescribe most often?
Based on 2023 Medicare Part D data, GERALD VOLCHECK, M.D.'s most frequently prescribed drugs include Montelukast Sodium, Prednisone, Albuterol Sulfate Hfa. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does GERALD VOLCHECK, M.D. accept Medicare?
GERALD VOLCHECK, M.D. appears in CMS Medicare data with 516 Part D claims and 77 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify GERALD VOLCHECK, M.D.'s credentials?
GERALD VOLCHECK, M.D.'s NPI is 1326028812 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