NPI registry status
Active
2026 NPPES data Psychiatry Physician NPI 1770524183 MD
Verify on CMS → William Karls, MD
Psychiatry Physician in Montrose, 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 54,383 in Psychiatry 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
2K
Medicare Part D claims · 103 beneficiaries · Psychiatry Physician avg: 1K
Generic prescribing
98%
generic claims · 2% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
William Karls, MD filed 2,477 Medicare Part D claims in 2024 as a Psychiatry Physician in Montrose, Colorado, prescribing 98% generic.
- 2K
- Part D claims, 2024
- 98%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥86th
- 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.
Federal trust snapshot
What official records show about William Karls, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1770524183), first enumerated 06/09/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 2,477 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1770524183 · Psychiatry Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-MID · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1770524183
- ENUM-LEGACY 2006
- TAX-MEGA 54K Psychiatry Physician
- RX-MID 2,477
- BOOK-LIGHT 954 in Colorado
- PHOTO-ENUM Robin Androphy, MD · 2006
William Karls, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
2,477 ≥ 86th percentile 86% of 1,416,883 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 · 2024
✓
Board certification likely (heuristic, not verified)
William Karls, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - 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 William Karls, MD?
Quality data not reportedPrimary specialty
Psychiatry Physician
Medicare Part D claims
2,477 145% vs specialty avg
Specialty distribution in Colorado
How Psychiatry 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 Psychiatry 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 | 1770524183 |
|---|---|
| Specialty | Psychiatry Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/09/2006 |
Hospital and facility affiliations
Facilities where William Karls, MD 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.
Southwest Colorado Mental Health Center Inc
Durango, CO
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 · Generic-heavy
William Karls, MD - brand share 2.0%
Psychiatry Physician average
2% brand-name claims vs 98% generic, on 2,477 2024 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 2024.
2,477
Total Claims
$210K
Total Drug Cost
103
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,841.3
- Total Day Supply
- 81,685
- Brand vs Generic
- 2% brand / 98% generic
- Brand Drug Cost
- $168K
- Generic Drug Cost
- $41K
Patient Demographics
- Average Patient Age
- 57.2 years
- Avg HCC Risk Score
- 1.24
- Gender Split
- 55% female / 45% male
- Age Distribution
- <65: 60, 65-74: 35, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What William Karls, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Aripiprazole
Aripiprazole
239 claims
- Trazodone Hcl
Trazodone Hcl
182 claims
- Buspirone Hcl
Buspirone Hcl
178 claims
- Sertraline Hcl
Sertraline Hcl
149 claims
- Quetiapine Fumarate
Quetiapine Fumarate
143 claims
- Lorazepam
Lorazepam
131 claims
- Lamotrigine
Lamotrigine
129 claims
- Clonazepam
Clonazepam
108 claims
| Drug | Claims |
|---|---|
| Aripiprazole | 239 |
| Trazodone Hcl | 182 |
| Buspirone Hcl | 178 |
| Sertraline Hcl | 149 |
| Quetiapine Fumarate | 143 |
| Lorazepam | 131 |
| Lamotrigine | 129 |
| Clonazepam | 108 |
| Risperidone | 85 |
| Alprazolam | 83 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Psychiatry Physician Overview
How William Karls, MD fits within the Psychiatry Physician landscape nationally.
54,383
Psychiatry Physician Providers in US
56
States with Psychiatry Physician
1,010
Avg Claims per Provider
William Karls, MD's 2,477 claims are above the specialty average of 1,010.
Nationwide Psychiatry Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Karls, 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 Psychiatry Physician Providers in Colorado
Other clinicians with the same primary specialty enrolled in Colorado, drawn from the same CMS NPPES roster as Karls.
One of 954 Psychiatry Physician providers enrolled in Colorado, 5 are shown here.
Dr. Ari Aal
DO
Boulder, CO
Ellen Aal
PMHNP
Boulder, CO
Dr. Alec Aaronson
DO
Aurora, CO
Dr. Galia Abadi
M.D.
Parker, CO
Dr. Daniel Abrams
MD
Aurora, CO
Compare Psychiatry Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is William Karls, MD's specialty? ▼
William Karls, MD specializes in Psychiatry Physician and practices in Montrose, Colorado. Credentials: MD.
How much does William Karls, MD prescribe under Medicare Part D? ▼
In 2024, William Karls, MD wrote 2,477 Medicare Part D claims totaling $210K in drug costs for 103 beneficiaries.
Where is William Karls, MD located? ▼
William Karls, MD is located at 605 MIAMI RD, Montrose, CO, 81401. Phone: (970) 252-3200.
What is William Karls, MD's NPI number? ▼
William Karls, MD's National Provider Identifier (NPI) is 1770524183, issued on 06/09/2006.
Does William Karls, MD prescribe more brand-name or generic drugs? ▼
William Karls, MD's prescribing is 2% brand-name and 98% generic drugs by claim count, with $168K in brand drug costs.
How many Psychiatry Physician providers are there in the US? ▼
There are 54,383 Psychiatry Physician providers across 56 states in the US. The average Psychiatry Physician provider writes 1,010 Medicare Part D claims per year.
What drugs does William Karls, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, William Karls, MD's most frequently prescribed drugs include Aripiprazole, Trazodone Hcl, Buspirone Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Karls, MD accept Medicare? ▼
William Karls, MD appears in CMS Medicare data with 2,477 Part D claims and 103 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Karls, MD's credentials? ▼
William Karls, MD's NPI is 1770524183 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 (2024). 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 August 2026 (NPPES) / 2024 (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 August 2026.