2026 NPPES data Rheumatology Physician NPI 1598854986 MD
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STEWART KOHLER, MD

Rheumatology Physician in FREDERICKSBURG, Virginia. 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
3K
Medicare Part D claims · 137 beneficiaries · Rheumatology Physician avg: 2K

What the federal data shows

STEWART KOHLER, MD filed 2,577 Medicare Part D claims in 2023 as a Rheumatology Physician in FREDERICKSBURG, Virginia.

3K
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.

STEWART KOHLER, MD's Medicare Part D volume vs every U.S. prescriber

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

2,577 Top 13% higher than 87% 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%). Below this entry. 600–800: 56,224 prescribers (4%). Below this entry. 800–1,000: 40,919 prescribers (3%). Below this entry. 1,000–1,200: 31,827 prescribers (2%). Below this entry. 1,200–1,400: 26,224 prescribers (2%). Below this entry. 1,400–1,600: 21,710 prescribers (2%). Below this entry. 1,600–1,800: 19,072 prescribers (1%). Below this entry. 1,800–2,000: 16,451 prescribers (1%). Below this entry. 2,000–2,200: 213,991 prescribers (16%). This entry sits in this band. 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)

STEWART KOHLER, 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 STEWART KOHLER, MD?

Quality data not reported

NPI registry status

Active

Issued 10/12/2006

NPI 1598854986

Primary specialty

Rheumatology Physician

Mid-sized

6,181 US NPIs in this specialty

Medicare Part D claims

2,577 25% vs specialty avg

2023 prescription claims

Specialty avg: 2,054

Specialty distribution in Virginia

How Rheumatology Physician compares to other specialties among Virginia providers

Virginia providers

Rheumatology Physician share within Virginia

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

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).

STEWART KOHLER, MD appears in the CMS NPPES registry as a Rheumatology Physician provider holding MD credentials at 2301 FALL HILL AVE, FREDERICKSBURG, VA, 22401, with a listed phone of (540) 373-1330. NPI 1598854986 was issued on 10/12/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what KOHLER 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 2,577 prescription claims written by this provider, covering 137 Medicare beneficiaries and totaling roughly $386K in drug spend, with an opioid prescribing rate of 3.2%. 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

2301 FALL HILL AVE
FREDERICKSBURG, VA 22401

Provider Details

NPI 1598854986
Specialty Rheumatology Physician
Credentials MD
Gender Male
NPI Issued 10/12/2006

Medicare Part D Prescribing Data

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

2,577
Total Claims
$386K
Total Drug Cost
137
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
6,204
Total Day Supply
181,616
Generic Drug Cost
$73K
Opioid Claims
82 (3.2% rate)
Antibiotic Claims
81

Patient Demographics

Average Patient Age
79.2 years
Avg HCC Risk Score
1.37
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 STEWART KOHLER, 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
Metoprolol Succinate
120
Rosuvastatin Calcium
112
Pantoprazole Sodium
108
Furosemide
81
Levothyroxine Sodium
79
Eliquis
Apixaban
70
Gabapentin
66
Famotidine
61
Prednisone
60
Montelukast Sodium
53

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

Rheumatology Physician Overview

How STEWART KOHLER, 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

STEWART KOHLER, MD's 2,577 claims are above the specialty average of 2,054.

Nearby Rheumatology Physician Providers in Virginia

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

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

Frequently Asked Questions

What is STEWART KOHLER, MD's specialty?
STEWART KOHLER, MD specializes in Rheumatology Physician and practices in FREDERICKSBURG, Virginia. Credentials: MD.
How much does STEWART KOHLER, MD prescribe under Medicare Part D?
In 2023, STEWART KOHLER, MD wrote 2,577 Medicare Part D claims totaling $386K in drug costs for 137 beneficiaries.
Where is STEWART KOHLER, MD located?
STEWART KOHLER, MD is located at 2301 FALL HILL AVE, FREDERICKSBURG, VA, 22401. Phone: (540) 373-1330.
What is STEWART KOHLER, MD's NPI number?
STEWART KOHLER, MD's National Provider Identifier (NPI) is 1598854986, issued on 10/12/2006.
Does STEWART KOHLER, MD prescribe opioids?
Yes, STEWART KOHLER, MD had 82 opioid claims in 2023 with an opioid prescribing rate of 3.2%.
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 STEWART KOHLER, MD prescribe most often?
Based on 2023 Medicare Part D data, STEWART KOHLER, MD's most frequently prescribed drugs include Metoprolol Succinate, Rosuvastatin Calcium, Pantoprazole Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does STEWART KOHLER, MD accept Medicare?
STEWART KOHLER, MD appears in CMS Medicare data with 2,577 Part D claims and 137 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify STEWART KOHLER, MD's credentials?
STEWART KOHLER, MD's NPI is 1598854986 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