NPI registry status
Active
2026 NPPES data Registered Dietitian NPI 1134222169 PA-C
Verify on CMS → Shirley Powell, PA-C
Registered Dietitian in Redding, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 66,712 in Registered Dietitian, 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
4K
Medicare Part D claims · 235 beneficiaries · Registered Dietitian avg: 762
Generic prescribing
60%
generic claims · 37% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
96.5/100
▲ 13 pts above national avg 83.5 · Exceptional
Industry payments
$290.21
3 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Shirley Powell, PA-C reported a CMS MIPS final score of 96.5/100 - above the 83.5 national average - and filed 3,654 Medicare Part D claims in 2024.
- 96.5/100
- MIPS score · +13 vs avg
- 4K
- Part D claims, 2024
- 60%
- generic prescribing
- $290.21
- industry payments (Sunshine Act)
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 Shirley Powell, PA-C
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1134222169), first enumerated 09/06/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 3,654 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 96.5/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$290.21 in reported industry payments (3 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Shirley Powell, PA-C's individual license status. Verify directly with the state medical board.
Source: MBC annual report 2023
- 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 1134222169 · Registered Dietitian
NPI-10 · ENUM-LEGACY · TAX-MEGA · MIPS-ELITE · RX-MID · BOOK-MID · PHOTO-FINISH
- NPI-10 1134222169
- ENUM-LEGACY 2006
- TAX-MEGA 67K Registered Dietitian
- MIPS-ELITE 96.5/100
- RX-MID 3,654
- BOOK-MID 7,002 in California
- PHOTO-FINISH Hannah Dressel, RD · ±0.1
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Katherine Poinde…
Katherine Poindexter, PA-C, RDN
96.3 MIPS pts
- Hannah Dressel, …
Hannah Dressel, RD
96.4 MIPS pts
- Powell · this pr…
Powell · this provider
96.5 MIPS pts
- Pamela Lyons, MP…
Pamela Lyons, MPH, RD, LDN, CDE
96.9 MIPS pts
- Suzanne De Boisb…
Suzanne De Boisblanc Tyler
96.9 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Shirley Powell, PA-C's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
97 ≥ 82nd percentile 82% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. 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 whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Shirley Powell, PA-C sits
This provider among registered dietitian peers
Across the 67 registered dietitian providers who report both Medicare Part D prescribing and a MIPS quality score, Shirley Powell, PA-C writes more Part D claims than 94% of them and scores higher on MIPS quality than 81% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one registered dietitian peer from a representative sample of 60; the gold marker is Shirley Powell, PA-C. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
What does the federal data show about Shirley Powell, PA-C?
High performer (top quartile)Primary specialty
Registered Dietitian
Medicare Part D claims
3,654 380% vs specialty avg
MIPS final score
96.5/100 13 pts vs avg
Specialty distribution in California
How Registered Dietitian compares to other specialties among California providers
Medicare quality performance, MIPS
Shirley Powell, PA-C's 2023 MIPS final score plotted against the Registered Dietitian national average
- MIPS Final Score
- 96.5/100
- vs 83.5 national avg · 2023 performance year
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 | 1134222169 |
|---|---|
| Specialty | Registered Dietitian |
| Credentials | PA-C |
| Gender | Female |
| NPI Issued | 09/06/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
96.5085
Final Score
Measured-score avg: 83.5
80.342
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Hospital and facility affiliations
Facilities where Shirley Powell, PA-C 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.
Dignity Health Medical Foundation
Redding, CA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Shirley Powell, PA-C. Source: openpaymentsdata.cms.gov.
Total received
$290
Largest payer
Abbott Laboratories
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
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 Shirley Powell, PA-C. To verify Shirley Powell, PA-C'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 · Above average
Shirley Powell, PA-C - brand share 37.0%
Registered Dietitian average
37% brand-name claims vs 60% generic, on 3,654 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.
3,654
Total Claims
$1.7M
Total Drug Cost
235
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 8,539.8
- Total Day Supply
- 251,257
- Brand vs Generic
- 37% brand / 60% generic
- Brand Drug Cost
- $1.6M
- Generic Drug Cost
- $69K
- Opioid Claims
- 58 (1.6% rate)
- Antibiotic Claims
- 74
Patient Demographics
- Average Patient Age
- 73.4 years
- Avg HCC Risk Score
- 1.49
- Gender Split
- 62% female / 38% male
- Age Distribution
- <65: 23, 65-74: 104, 75-84: 84, 85+: 24
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Shirley Powell, PA-C prescribes most
Top Medicare Part D drugs by claim count, 2024
- Ozempic
Ozempic
418 claims
- Atorvastatin Calcium 142
Atorvastatin Calcium
142 claims
- Synthroid 142
Synthroid
142 claims
- Pantoprazole Sodium 129
Pantoprazole Sodium
129 claims
- Jardiance 112
Jardiance
112 claims
- Tresiba Flextouch … 112
Tresiba Flextouch U-200
112 claims
- Levothyroxine Sodium 91
Levothyroxine Sodium
91 claims
- Rosuvastatin Calcium 91
Rosuvastatin Calcium
91 claims
| Drug | Claims |
|---|---|
| Ozempic Semaglutide | 418 |
| Atorvastatin Calcium | 142 |
| Synthroid Levothyroxine Sodium | 142 |
| Pantoprazole Sodium | 129 |
| Jardiance Empagliflozin | 112 |
| Tresiba Flextouch U-200 Insulin Degludec | 112 |
| Levothyroxine Sodium | 91 |
| Rosuvastatin Calcium | 91 |
| Lisinopril | 85 |
| Metformin Hcl Er Metformin Hcl | 66 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Registered Dietitian Overview
How Shirley Powell, PA-C fits within the Registered Dietitian landscape nationally.
66,712
Registered Dietitian Providers in US
55
States with Registered Dietitian
762
Avg Claims per Provider
Shirley Powell, PA-C's 3,654 claims are above the specialty average of 762.
Nationwide Registered Dietitian peers with similar MIPS or enrollment year
Two federal-record peer sets for Powell, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (96.5 here).
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Registered Dietitian Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Powell.
One of 7,002 Registered Dietitian providers enrolled in California, 5 are shown here.
Dr. Nazanin Abbaspour
PHD, RDN, IFNCP
San Diego, CA
Michelle Abbey
San Diego, CA
Emily Abbott
Torrance, CA
Fatima Azzahra Abdelhafeez
RD
Anaheim, CA
Sulaima Abdin-Arafeh
Pomona, CA
Compare Registered Dietitian nationally: see state-by-state distribution →
Frequently Asked Questions
What is Shirley Powell, PA-C's specialty? ▼
Shirley Powell, PA-C specializes in Registered Dietitian and practices in Redding, California. Credentials: PA-C.
How much does Shirley Powell, PA-C prescribe under Medicare Part D? ▼
In 2024, Shirley Powell, PA-C wrote 3,654 Medicare Part D claims totaling $1.7M in drug costs for 235 beneficiaries.
What is Shirley Powell, PA-C's Medicare quality score? ▼
Shirley Powell, PA-C has a CMS MIPS Final Score of 96.5/100 (Quality: 80.3). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Shirley Powell, PA-C located? ▼
Shirley Powell, PA-C is located at 2510 AIRPARK DR STE 104, Redding, CA, 96001. Phone: (530) 242-3570.
What is Shirley Powell, PA-C's NPI number? ▼
Shirley Powell, PA-C's National Provider Identifier (NPI) is 1134222169, issued on 09/06/2006.
Does Shirley Powell, PA-C prescribe more brand-name or generic drugs? ▼
Shirley Powell, PA-C's prescribing is 37% brand-name and 60% generic drugs by claim count, with $1.6M in brand drug costs.
Does Shirley Powell, PA-C prescribe opioids? ▼
Yes, Shirley Powell, PA-C had 58 opioid claims in 2024 with an opioid prescribing rate of 1.6%.
How many Registered Dietitian providers are there in the US? ▼
There are 66,712 Registered Dietitian providers across 55 states in the US. The average Registered Dietitian provider writes 762 Medicare Part D claims per year.
What drugs does Shirley Powell, PA-C prescribe most often? ▼
Based on 2024 Medicare Part D data, Shirley Powell, PA-C's most frequently prescribed drugs include Ozempic, Atorvastatin Calcium, Synthroid. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Shirley Powell, PA-C accept Medicare? ▼
Shirley Powell, PA-C appears in CMS Medicare data with 3,654 Part D claims and 235 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Shirley Powell, PA-C's credentials? ▼
Shirley Powell, PA-C's NPI is 1134222169 with credentials PA-C. 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.