2026 NPPES data Medical Physician Assistant NPI 1659551877 MSPAS/MPH
Verify on CMS →

MILENNA BELL, MSPAS/MPH

Medical Physician Assistant in WALNUT CREEK, California. 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
2K
Medicare Part D claims · 543 beneficiaries · Medical Physician Assistant avg: 1K
Generic prescribing
89%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

MILENNA BELL, MSPAS/MPH filed 2,055 Medicare Part D claims in 2023 as a Medical Physician Assistant in WALNUT CREEK, California, prescribing 89% generic.

2K
Part D claims, 2023
89%
generic prescribing

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.

MILENNA BELL, MSPAS/MPH's Medicare Part D volume vs every U.S. prescriber

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

2,055 Top 16% higher than 84% 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

What does the federal data show about MILENNA BELL, MSPAS/MPH?

Quality data not reported

NPI registry status

Active

Issued 11/05/2007

NPI 1659551877

Primary specialty

Medical Physician Assistant

Mid-sized

40,527 US NPIs in this specialty

Medicare Part D claims

2,055 91% vs specialty avg

2023 prescription claims

Specialty avg: 1,077

Specialty distribution in California

How Medical Physician Assistant compares to other specialties among California providers

California providers

Medical Physician Assistant share within California

1. Medical Physician Assistant42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Medical Physician Assistant share within California

Specialty board-certification context

Estimated specialty board-certified rate — Medical Physician Assistant (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Medical Physician Assistant ABMS/AOA estimate

Est. board-certified rate (Medical Physician Assistant) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Medical Physician Assistant) — 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).

MILENNA BELL, MSPAS/MPH appears in the CMS NPPES registry as a Medical Physician Assistant provider holding MSPAS/MPH credentials at 1450 TREAT BLVD # 220B, WALNUT CREEK, CA, 94597, with a listed phone of (925) 937-1770. NPI 1659551877 was issued on 11/05/2007. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what BELL 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 2,055 prescription claims written by this provider, covering 543 Medicare beneficiaries and totaling roughly $90K in drug spend, split 11% brand-name and 89% generic by claim count, with an opioid prescribing rate of 1.5%. 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.

Medical Physician Assistant is a mid-sized specialty nationwide, with 40,527 enrolled providers across 55 states and an average of 1,077 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

1450 TREAT BLVD # 220B
WALNUT CREEK, CA 94597

Provider Details

NPI 1659551877
Specialty Medical Physician Assistant
Credentials MSPAS/MPH
Gender Female
NPI Issued 11/05/2007

Hospital and facility affiliations

Facilities where MILENNA BELL, MSPAS/MPH 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.

KAISER FOUNDATION HEALTH PLAN OF THE NORTHWEST
LONGVIEW, WA

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

License & disciplinary context — California MBC 2023 annual report

Aggregate state board data only — NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 — they are NOT specific to MILENNA BELL, MSPAS/MPH. To verify MILENNA BELL, MSPAS/MPH's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.

576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases

MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.

Brand vs generic prescribing mix · Typical

MILENNA BELL, MSPAS/MPH — brand share 11.0%
Specialty average (est.)

11% brand-name claims vs 89% generic, on 2,055 2023 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 2023.

2,055
Total Claims
$90K
Total Drug Cost
543
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
4,887
Total Day Supply
141,782
Brand vs Generic
11% brand / 89% generic
Brand Drug Cost
$57K
Generic Drug Cost
$33K
Opioid Claims
31 (1.5% rate)
Antibiotic Claims
54

Patient Demographics

Average Patient Age
74.1 years
Avg HCC Risk Score
1.18
Gender Split
59% female / 41% male
Age Distribution
<65: 41, 65-74: 253, 75-84: 204, 85+: 45

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What MILENNA BELL, MSPAS/MPH 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
Atorvastatin Calcium
128
Lisinopril
98
Pantoprazole Sodium
87
Levothyroxine Sodium
85
Losartan Potassium
69
Amlodipine Besylate
61
Metoprolol Tartrate
59
Simvastatin
54
Potassium Chloride
47
Trazodone Hcl
47

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

Medical Physician Assistant Overview

How MILENNA BELL, MSPAS/MPH fits within the Medical Physician Assistant landscape nationally.

40,527
Medical Physician Assistant Providers in US
55
States with Medical Physician Assistant
1,077
Avg Claims per Provider

MILENNA BELL, MSPAS/MPH's 2,055 claims are above the specialty average of 1,077.

Nearby Medical Physician Assistant Providers in California

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

Compare Medical Physician Assistant nationally: see state-by-state distribution →

Frequently Asked Questions

What is MILENNA BELL, MSPAS/MPH's specialty?
MILENNA BELL, MSPAS/MPH specializes in Medical Physician Assistant and practices in WALNUT CREEK, California. Credentials: MSPAS/MPH.
How much does MILENNA BELL, MSPAS/MPH prescribe under Medicare Part D?
In 2023, MILENNA BELL, MSPAS/MPH wrote 2,055 Medicare Part D claims totaling $90K in drug costs for 543 beneficiaries.
Where is MILENNA BELL, MSPAS/MPH located?
MILENNA BELL, MSPAS/MPH is located at 1450 TREAT BLVD # 220B, WALNUT CREEK, CA, 94597. Phone: (925) 937-1770.
What is MILENNA BELL, MSPAS/MPH's NPI number?
MILENNA BELL, MSPAS/MPH's National Provider Identifier (NPI) is 1659551877, issued on 11/05/2007.
Does MILENNA BELL, MSPAS/MPH prescribe more brand-name or generic drugs?
MILENNA BELL, MSPAS/MPH's prescribing is 11% brand-name and 89% generic drugs by claim count, with $57K in brand drug costs.
Does MILENNA BELL, MSPAS/MPH prescribe opioids?
Yes, MILENNA BELL, MSPAS/MPH had 31 opioid claims in 2023 with an opioid prescribing rate of 1.5%.
How many Medical Physician Assistant providers are there in the US?
There are 40,527 Medical Physician Assistant providers across 55 states in the US. The average Medical Physician Assistant provider writes 1,077 Medicare Part D claims per year.
What drugs does MILENNA BELL, MSPAS/MPH prescribe most often?
Based on 2023 Medicare Part D data, MILENNA BELL, MSPAS/MPH's most frequently prescribed drugs include Atorvastatin Calcium, Lisinopril, Pantoprazole Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does MILENNA BELL, MSPAS/MPH accept Medicare?
MILENNA BELL, MSPAS/MPH appears in CMS Medicare data with 2,055 Part D claims and 543 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify MILENNA BELL, MSPAS/MPH's credentials?
MILENNA BELL, MSPAS/MPH's NPI is 1659551877 with credentials MSPAS/MPH. 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