NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1073579447 M.D.
Verify on CMS → Karen Chandler, M.D.
Family Medicine Physician in Tucson, Arizona.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 150,125 in Family Medicine 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
175
Medicare Part D claims · 47 beneficiaries · Family Medicine Physician avg: 4K
Generic prescribing
83%
generic claims · 17% 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
Karen Chandler, M.D. filed 175 Medicare Part D claims in 2024 as a Family Medicine Physician in Tucson, Arizona, prescribing 83% generic.
- 175
- Part D claims, 2024
- 83%
- generic prescribing
- ≥34th
- 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 Karen Chandler, M.D.
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 1073579447), first enumerated 04/25/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 175 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
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- 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 1073579447 · Family Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1073579447
- ENUM-LEGACY 2006
- TAX-MEGA 150K Family Medicine
- RX-LIGHT 175
- BOOK-LIGHT 3,070 in Arizona
- PHOTO-ENUM Marcos Rejtman · 2006
Karen Chandler, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
175 ≥ 34th percentile 34% 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-eligible specialty (heuristic, not verified)
Karen Chandler, 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 Karen Chandler, M.D.?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
175 95% vs specialty avg
Specialty distribution in Arizona
How Family Medicine Physician compares to other specialties among Arizona 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 Family Medicine 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 | 1073579447 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 04/25/2006 |
Brand vs generic prescribing mix · Typical
Karen Chandler, M.D. - brand share 17.0%
Family Medicine Physician average
17% brand-name claims vs 83% generic, on 175 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.
175
Total Claims
$10K
Total Drug Cost
47
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 236.333
- Total Day Supply
- 6,258
- Brand vs Generic
- 17% brand / 83% generic
- Brand Drug Cost
- $8K
- Generic Drug Cost
- $3K
Patient Demographics
- Average Patient Age
- 84.6 years
- Avg HCC Risk Score
- 2.58
- Gender Split
- 55% female / 45% male
- Age Distribution
- <65: 0, 65-74: N/A, 75-84: N/A, 85+: 27
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Karen Chandler, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Atenolol
Atenolol
22 claims
- Levothyroxine Sodium
Levothyroxine Sodium
20 claims
- Losartan Potassium
Losartan Potassium
19 claims
- Tamsulosin Hcl
Tamsulosin Hcl
15 claims
- Hydralazine Hcl
Hydralazine Hcl
11 claims
| Drug | Claims |
|---|---|
| Atenolol | 22 |
| Levothyroxine Sodium | 20 |
| Losartan Potassium | 19 |
| Tamsulosin Hcl | 15 |
| Hydralazine Hcl | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How Karen Chandler, M.D. fits within the Family Medicine Physician landscape nationally.
150,125
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,519
Avg Claims per Provider
Karen Chandler, M.D.'s 175 claims are below the specialty average of 3,519.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Chandler, both outside Arizona 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 Family Medicine Physician Providers in Arizona
Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as Chandler.
One of 3,070 Family Medicine Physician providers enrolled in Arizona, 5 are shown here.
Dr. Muhammad Aamer
M.D.
Yuma, AZ
Dr. Ndidi Abara
M.D.
Yuma, AZ
Dr. Steven Abdelmalak
MD
Scottsdale, AZ
Lindsey Abeyta
FNP
Tucson, AZ
Dr. Modupeola Abiodun
M.D.
Chandler, AZ
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Karen Chandler, M.D.'s specialty? ▼
Karen Chandler, M.D. specializes in Family Medicine Physician and practices in Tucson, Arizona. Credentials: M.D..
How much does Karen Chandler, M.D. prescribe under Medicare Part D? ▼
In 2024, Karen Chandler, M.D. wrote 175 Medicare Part D claims totaling $10K in drug costs for 47 beneficiaries.
Where is Karen Chandler, M.D. located? ▼
Karen Chandler, M.D. is located at 5301 E GRANT RD, Tucson, AZ, 85712. Phone: (520) 324-1205.
What is Karen Chandler, M.D.'s NPI number? ▼
Karen Chandler, M.D.'s National Provider Identifier (NPI) is 1073579447, issued on 04/25/2006.
Does Karen Chandler, M.D. prescribe more brand-name or generic drugs? ▼
Karen Chandler, M.D.'s prescribing is 17% brand-name and 83% generic drugs by claim count, with $8K in brand drug costs.
How many Family Medicine Physician providers are there in the US? ▼
There are 150,125 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,519 Medicare Part D claims per year.
What drugs does Karen Chandler, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Karen Chandler, M.D.'s most frequently prescribed drugs include Atenolol, Levothyroxine Sodium, Losartan Potassium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Karen Chandler, M.D. accept Medicare? ▼
Karen Chandler, M.D. appears in CMS Medicare data with 175 Part D claims and 47 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Karen Chandler, M.D.'s credentials? ▼
Karen Chandler, M.D.'s NPI is 1073579447 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
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.