2026 NPPES data Rheumatology Physician NPI 1598758351 MD
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MARC MILLER, MD

Rheumatology Physician in KINGMAN, 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
307
Medicare Part D claims · 94 beneficiaries · Rheumatology Physician avg: 2K
Generic prescribing
67%
generic claims · 33% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

MARC MILLER, MD filed 307 Medicare Part D claims in 2023 as a Rheumatology Physician in KINGMAN, Arizona, prescribing 67% generic.

307
Part D claims, 2023
67%
generic prescribing

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.

MARC MILLER, MD's Medicare Part D volume vs every U.S. prescriber

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

307 Top 43% higher than 57% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). This entry sits in this band. 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)

MARC MILLER, MD 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 MARC MILLER, MD?

Quality data not reported

NPI registry status

Active

Issued 08/26/2005

NPI 1598758351

Primary specialty

Rheumatology Physician

Mid-sized

6,181 US NPIs in this specialty

Medicare Part D claims

307 85% vs specialty avg

2023 prescription claims

Specialty avg: 2,054

Specialty distribution in Arizona

How Rheumatology Physician compares to other specialties among Arizona providers

Arizona providers

Rheumatology Physician share within Arizona

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

Specialty board-certification context

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

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

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

0%100%78%
Est. board-certified rate (Rheumatology 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).

MARC MILLER, MD appears in the CMS NPPES registry as a Rheumatology Physician provider holding MD credentials at 3801 SANTA ROSA DR STE 301, KINGMAN, AZ, 86401, with a listed phone of (928) 681-8730. NPI 1598758351 was issued on 08/26/2005. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what MILLER 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 307 prescription claims written by this provider, covering 94 Medicare beneficiaries and totaling roughly $803K in drug spend, split 33% brand-name and 67% 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.

Rheumatology Physician is a mid-sized specialty nationwide, with 6,181 enrolled providers across 52 states and an average of 2,054 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

3801 SANTA ROSA DR STE 301
KINGMAN, AZ 86401

Provider Details

NPI 1598758351
Specialty Rheumatology Physician
Credentials MD
Gender Male
NPI Issued 08/26/2005

Brand vs generic prescribing mix · Above average

MARC MILLER, MD — brand share 33.0%
Specialty average (est.)

33% brand-name claims vs 67% generic, on 307 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.

307
Total Claims
$803K
Total Drug Cost
94
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
539
Total Day Supply
15,887
Brand vs Generic
33% brand / 67% generic
Brand Drug Cost
$792K
Generic Drug Cost
$11K

Patient Demographics

Average Patient Age
70.1 years
Avg HCC Risk Score
1.39
Gender Split
65% female / 35% male

Top Prescribed Drugs (Medicare Part D)

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

What MARC MILLER, MD 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
Methotrexate
Methotrexate Sodium
55
Hydroxychloroquine Sulfate
40
Prednisone
32
Xeljanz Xr
Tofacitinib Citrate
19
Meloxicam
16
Mycophenolate Mofetil
16
Allopurinol
11
Leflunomide
11

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

Rheumatology Physician Overview

How MARC MILLER, MD fits within the Rheumatology Physician landscape nationally.

6,181
Rheumatology Physician Providers in US
52
States with Rheumatology Physician
2,054
Avg Claims per Provider

MARC MILLER, MD's 307 claims are below the specialty average of 2,054.

Nearby Rheumatology Physician Providers in Arizona

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

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

Frequently Asked Questions

What is MARC MILLER, MD's specialty?
MARC MILLER, MD specializes in Rheumatology Physician and practices in KINGMAN, Arizona. Credentials: MD.
How much does MARC MILLER, MD prescribe under Medicare Part D?
In 2023, MARC MILLER, MD wrote 307 Medicare Part D claims totaling $803K in drug costs for 94 beneficiaries.
Where is MARC MILLER, MD located?
MARC MILLER, MD is located at 3801 SANTA ROSA DR STE 301, KINGMAN, AZ, 86401. Phone: (928) 681-8730.
What is MARC MILLER, MD's NPI number?
MARC MILLER, MD's National Provider Identifier (NPI) is 1598758351, issued on 08/26/2005.
Does MARC MILLER, MD prescribe more brand-name or generic drugs?
MARC MILLER, MD's prescribing is 33% brand-name and 67% generic drugs by claim count, with $792K in brand drug costs.
How many Rheumatology Physician providers are there in the US?
There are 6,181 Rheumatology Physician providers across 52 states in the US. The average Rheumatology Physician provider writes 2,054 Medicare Part D claims per year.
What drugs does MARC MILLER, MD prescribe most often?
Based on 2023 Medicare Part D data, MARC MILLER, MD's most frequently prescribed drugs include Methotrexate, Hydroxychloroquine Sulfate, Prednisone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does MARC MILLER, MD accept Medicare?
MARC MILLER, MD appears in CMS Medicare data with 307 Part D claims and 94 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify MARC MILLER, MD's credentials?
MARC MILLER, MD's NPI is 1598758351 with credentials MD. 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