NPI registry status
Active
2026 NPPES data Clinical Genetics (M.D.) Physician NPI 1659459444 MD
Verify on CMS → John Baker, MD
Clinical Genetics (M.D.) Physician in Phoenix, 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 839 in Clinical Genetics (M.D.) 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
29
Medicare Part D claims · Clinical Genetics (M.D.) Physician avg: 275
Generic prescribing
0%
generic claims · 93% 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
John Baker, MD filed 29 Medicare Part D claims in 2024 as a Clinical Genetics (M.D.) Physician in Phoenix, Arizona, prescribing 0% generic.
- 29
- Part D claims, 2024
- 0%
- generic prescribing
- ≥0th
- 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 John Baker, 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 1659459444), first enumerated 11/01/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 29 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 1659459444 · Clinical Genetics (M.D.) Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-TRACE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1659459444
- ENUM-LEGACY 2006
- TAX-NARROW 839
- RX-TRACE 29
- BOOK-THIN 11 in Arizona
- PHOTO-ENUM Warren Cohen · 2006
John Baker, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
29 ≥ 0th percentile 0% 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)
John Baker, 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 John Baker, MD?
Quality data not reportedPrimary specialty
Clinical Genetics (M.D.) Physician
Medicare Part D claims
29 89% vs specialty avg
Specialty distribution in Arizona
How Clinical Genetics (M.D.) 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 Clinical Genetics (M.D.) 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 | 1659459444 |
|---|---|
| Specialty | Clinical Genetics (M.D.) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 11/01/2006 |
Brand vs generic prescribing mix · Brand-heavy
John Baker, MD - brand share 93.0%
Clinical Genetics (M.D.) Physician average
93% brand-name claims vs 0% generic, on 29 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.
29
Total Claims
$658K
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 29
- Total Day Supply
- 830
- Brand vs Generic
- 93% brand / 0% generic
- Brand Drug Cost
- $638K
Patient Demographics
- Average Patient Age
- 56.0 years
- Avg HCC Risk Score
- 1.67
Clinical Genetics (M.D.) Physician Overview
How John Baker, MD fits within the Clinical Genetics (M.D.) Physician landscape nationally.
839
Clinical Genetics (M.D.) Physician Providers in US
50
States with Clinical Genetics (M.D.) Physician
275
Avg Claims per Provider
John Baker, MD's 29 claims are below the specialty average of 275.
Nationwide Clinical Genetics (M.D.) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Baker, 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 Clinical Genetics (M.D.) Physician Providers in Arizona
Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as Baker.
One of 11 Clinical Genetics (M.D.) Physician providers enrolled in Arizona, 5 are shown here.
Dr. Esteban Astiazaran Symonds
M.D,
Tucson, AZ
Dr. June-Anne Gold
M.D.
Scottsdale, AZ
Dr. Theresa Grebe
M.D.
Phoenix, AZ
Shagun Kaur
Phoenix, AZ
Dr. Kristin Lindstrom
MD
Phoenix, AZ
Compare Clinical Genetics (M.D.) Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is John Baker, MD's specialty? ▼
John Baker, MD specializes in Clinical Genetics (M.D.) Physician and practices in Phoenix, Arizona. Credentials: MD.
How much does John Baker, MD prescribe under Medicare Part D? ▼
In 2024, John Baker, MD wrote 29 Medicare Part D claims totaling $658K in drug costs for N/A beneficiaries.
Where is John Baker, MD located? ▼
John Baker, MD is located at 1920 E CAMBRIDGE AVE STE 304, Phoenix, AZ, 85006. Phone: (602) 933-4363.
What is John Baker, MD's NPI number? ▼
John Baker, MD's National Provider Identifier (NPI) is 1659459444, issued on 11/01/2006.
Does John Baker, MD prescribe more brand-name or generic drugs? ▼
John Baker, MD's prescribing is 93% brand-name and 0% generic drugs by claim count, with $638K in brand drug costs.
How many Clinical Genetics (M.D.) Physician providers are there in the US? ▼
There are 839 Clinical Genetics (M.D.) Physician providers across 50 states in the US. The average Clinical Genetics (M.D.) Physician provider writes 275 Medicare Part D claims per year.
Does John Baker, MD accept Medicare? ▼
John Baker, MD appears in CMS Medicare data with 29 Part D claims and N/A Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Baker, MD's credentials? ▼
John Baker, MD's NPI is 1659459444 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.