NPI registry status
Active
2026 NPPES data Rheumatology Physician NPI 1104881226 MD
Verify on CMS → James Singleton, MD
Rheumatology Physician in Highlands Ranch, Colorado.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 6,200 in Rheumatology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
1K
Medicare Part D claims · 146 beneficiaries · Rheumatology Physician avg: 2K
What the federal data shows
James Singleton, MD filed 1,008 Medicare Part D claims in 2023 as a Rheumatology Physician in Highlands Ranch, Colorado.
- 1K
- Part D claims, 2023
- ≥76th
- pct by Part D claim volume (lower-bound band)
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.
CMS NPPES provider registry desk
NPI 1104881226 · Rheumatology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-MID · BOOK-THIN · PHOTO-ENUM
- NPI-10 1104881226
- ENUM-LEGACY 2006
- TAX-MID 6K Rheumatology Physician
- RX-MID 1,008
- BOOK-THIN 112 in Colorado
- PHOTO-ENUM Veronica Mesquida · 2006
James Singleton, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,008 ≥ 76th percentile 76% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
James Singleton, 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 James Singleton, MD?
Quality data not reportedPrimary specialty
Rheumatology Physician
Medicare Part D claims
1,008 51% vs specialty avg
Specialty distribution in Colorado
How Rheumatology Physician compares to other specialties among Colorado providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Rheumatology Physician. Verify directly:
How MIPS and board certification work
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).
Practice Address
Provider Details
| NPI | 1104881226 |
|---|---|
| Specialty | Rheumatology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 04/20/2006 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
1,008
Total Claims
$198K
Total Drug Cost
146
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,872
- Total Day Supply
- 55,011
- Generic Drug Cost
- $27K
- Opioid Claims
- 34 (3.4% rate)
Patient Demographics
- Average Patient Age
- 76.5 years
- Avg HCC Risk Score
- 1.70
- Gender Split
- 64% female / 36% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What James Singleton, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Methotrexate
Methotrexate
275 claims
- Prednisone 103
Prednisone
103 claims
- Allopurinol 93
Allopurinol
93 claims
- Leucovorin Calcium 59
Leucovorin Calcium
59 claims
- Hydroxychloroquine… 57
Hydroxychloroquine Sulfate
57 claims
- Folic Acid 41
Folic Acid
41 claims
- Leflunomide 38
Leflunomide
38 claims
- Gabapentin 30
Gabapentin
30 claims
| Drug | Claims |
|---|---|
| Methotrexate Methotrexate Sodium | 275 |
| Prednisone | 103 |
| Allopurinol | 93 |
| Leucovorin Calcium | 59 |
| Hydroxychloroquine Sulfate | 57 |
| Folic Acid | 41 |
| Leflunomide | 38 |
| Gabapentin | 30 |
| Diclofenac Sodium | 26 |
| Sulfasalazine | 25 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Rheumatology Physician Overview
How James Singleton, MD fits within the Rheumatology Physician landscape nationally.
6,200
Rheumatology Physician Providers in US
52
States with Rheumatology Physician
2,054
Avg Claims per Provider
James Singleton, MD's 1,008 claims are below the specialty average of 2,054.
Nationwide Rheumatology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Singleton, both outside Colorado so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Rheumatology Physician Providers in Colorado
Other clinicians with the same primary specialty enrolled in Colorado, drawn from the same CMS NPPES roster as Singleton.
One of 112 Rheumatology Physician providers enrolled in Colorado, 5 are shown here.
Dr. Phyllis Acker
RN
Lafayette, CO
Dr. Vivianne Allsop
MD
Denver, CO
Dr. Christopher Antolini
MD
Denver, CO
Dr. Elizabeth Arena
DO, MPH
Grand Junction, CO
Dr. Michael Baker
MD
Colorado Springs, CO
Compare Rheumatology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is James Singleton, MD's specialty? ▼
James Singleton, MD specializes in Rheumatology Physician and practices in Highlands Ranch, Colorado. Credentials: MD.
How much does James Singleton, MD prescribe under Medicare Part D? ▼
In 2023, James Singleton, MD wrote 1,008 Medicare Part D claims totaling $198K in drug costs for 146 beneficiaries.
Where is James Singleton, MD located? ▼
James Singleton, MD is located at 206 W COUNTY LINE ROAD, Highlands Ranch, CO, 80129. Phone: (303) 788-8355.
What is James Singleton, MD's NPI number? ▼
James Singleton, MD's National Provider Identifier (NPI) is 1104881226, issued on 04/20/2006.
Does James Singleton, MD prescribe opioids? ▼
Yes, James Singleton, MD had 34 opioid claims in 2023 with an opioid prescribing rate of 3.4%.
How many Rheumatology Physician providers are there in the US? ▼
There are 6,200 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 James Singleton, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, James Singleton, MD's most frequently prescribed drugs include Methotrexate, Prednisone, Allopurinol. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does James Singleton, MD accept Medicare? ▼
James Singleton, MD appears in CMS Medicare data with 1,008 Part D claims and 146 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify James Singleton, MD's credentials? ▼
James Singleton, MD's NPI is 1104881226 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
View source datasets and methodology notes
- 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
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.