2026 NPPES data Clinical & Laboratory Immunology (Allergy & Immunology) Physician NPI 1841250321 M.D.
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HAROLD KAISER, M.D.

Clinical & Laboratory Immunology (Allergy & Immunology) Physician in MINNEAPOLIS, 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
51
Medicare Part D claims · Clinical & Laboratory Immunology (Allergy & Immunology) Physician avg: 701

What the federal data shows

HAROLD KAISER, M.D. filed 51 Medicare Part D claims in 2023 as a Clinical & Laboratory Immunology (Allergy & Immunology) Physician in MINNEAPOLIS, Minnesota.

51
Part D claims, 2023

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.

HAROLD KAISER, M.D.'s Medicare Part D volume vs every U.S. prescriber

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

51 0th percentile higher than 0% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). This entry sits in this band. 200–400: 182,923 prescribers (13%). Above this entry. 400–600: 90,619 prescribers (7%). Above this entry. 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-eligible specialty (heuristic — not verified)

HAROLD KAISER, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about HAROLD KAISER, M.D.?

Quality data not reported

NPI registry status

Active

Issued 03/27/2006

NPI 1841250321

Primary specialty

Clinical & Laboratory Immunology (Allergy & Immunology) Physician

Rare

97 US NPIs in this specialty

Medicare Part D claims

51 93% vs specialty avg

2023 prescription claims

Specialty avg: 701

Specialty distribution in Minnesota

How Clinical & Laboratory Immunology (Allergy & Immunology) Physician compares to other specialties among Minnesota providers

Minnesota providers

Clinical & Laboratory Immunology (Allergy & Immunology) Physician share within Minnesota

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

Specialty board-certification context

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

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

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

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

HAROLD KAISER, M.D. appears in the CMS NPPES registry as a Clinical & Laboratory Immunology (Allergy & Immunology) Physician provider holding M.D. credentials at 825 NICOLLET MALL, MINNEAPOLIS, MN, 55402, with a listed phone of (612) 338-3333. NPI 1841250321 was issued on 03/27/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what KAISER 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 51 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $4K 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.

Clinical & Laboratory Immunology (Allergy & Immunology) Physician is a narrow specialty nationwide, with 97 enrolled providers across 29 states and an average of 701 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

825 NICOLLET MALL
MINNEAPOLIS, MN 55402

Provider Details

NPI 1841250321
Specialty Clinical & Laboratory Immunology (Allergy & Immunology) Physician
Credentials M.D.
Gender Male
NPI Issued 03/27/2006

Medicare Part D Prescribing Data

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

51
Total Claims
$4K
Total Drug Cost
N/A
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
103
Total Day Supply
2,736
Generic Drug Cost
$1K

Patient Demographics

Average Patient Age
83.0 years
Avg HCC Risk Score
1.78

Clinical & Laboratory Immunology (Allergy & Immunology) Physician Overview

How HAROLD KAISER, M.D. fits within the Clinical & Laboratory Immunology (Allergy & Immunology) Physician landscape nationally.

97
Clinical & Laboratory Immunology (Allergy & Immunology) Physician Providers in US
29
States with Clinical & Laboratory Immunology (Allergy & Immunology) Physician
701
Avg Claims per Provider

HAROLD KAISER, M.D.'s 51 claims are below the specialty average of 701.

Nearby Clinical & Laboratory Immunology (Allergy & Immunology) Physician Providers in Minnesota

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

Compare Clinical & Laboratory Immunology (Allergy & Immunology) Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is HAROLD KAISER, M.D.'s specialty?
HAROLD KAISER, M.D. specializes in Clinical & Laboratory Immunology (Allergy & Immunology) Physician and practices in MINNEAPOLIS, Minnesota. Credentials: M.D..
How much does HAROLD KAISER, M.D. prescribe under Medicare Part D?
In 2023, HAROLD KAISER, M.D. wrote 51 Medicare Part D claims totaling $4K in drug costs for N/A beneficiaries.
Where is HAROLD KAISER, M.D. located?
HAROLD KAISER, M.D. is located at 825 NICOLLET MALL, MINNEAPOLIS, MN, 55402. Phone: (612) 338-3333.
What is HAROLD KAISER, M.D.'s NPI number?
HAROLD KAISER, M.D.'s National Provider Identifier (NPI) is 1841250321, issued on 03/27/2006.
How many Clinical & Laboratory Immunology (Allergy & Immunology) Physician providers are there in the US?
There are 97 Clinical & Laboratory Immunology (Allergy & Immunology) Physician providers across 29 states in the US. The average Clinical & Laboratory Immunology (Allergy & Immunology) Physician provider writes 701 Medicare Part D claims per year.
Does HAROLD KAISER, M.D. accept Medicare?
HAROLD KAISER, M.D. appears in CMS Medicare data with 51 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify HAROLD KAISER, M.D.'s credentials?
HAROLD KAISER, M.D.'s NPI is 1841250321 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