NPI registry status
Active
2026 NPPES data Colon & Rectal Surgery Physician NPI 1891130100 MD
Verify on CMS → Allison Aka, MD
Colon & Rectal Surgery Physician in Loma Linda, 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 1,608 in Colon & Rectal Surgery 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
140
Medicare Part D claims · 58 beneficiaries · Colon & Rectal Surgery Physician avg: 196
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
85.2/100
▲ 2 pts above national avg 83.1 · Above neutral
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Allison Aka, MD reported a CMS MIPS final score of 85.2/100 - above the 83.1 national average - and filed 140 Medicare Part D claims in 2023.
- 85.2/100
- MIPS score · +2 vs avg
- 140
- Part D claims, 2023
- 88%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Allison Aka, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
85 49th percentile higher than 49% of 477,587 scored providers
Each bar is a band; taller bars hold more scored 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.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Allison Aka, MD sits
This provider among colon & rectal surgery physician peers
Across the 536 colon & rectal surgery physician providers who report both Medicare Part D prescribing and a MIPS quality score, Allison Aka, MD writes more Part D claims than 46% of them and scores higher on MIPS quality than 47% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one colon & rectal surgery physician peer from a representative sample of 60; the gold marker is Allison Aka, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Allison Aka, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Allison Aka, MD?
High performer (top quartile)Primary specialty
Colon & Rectal Surgery Physician
Medicare Part D claims
140 29% vs specialty avg
MIPS final score
85.2/100 2.1 pts vs avg
Specialty distribution in California
How Colon & Rectal Surgery Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Allison Aka, MD's 2023 MIPS final score plotted against the Colon & Rectal Surgery Physician national average
- MIPS Final Score
- 85.2/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Colon & Rectal Surgery Physician) - 85.2/100 vs national avg 83.1
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).
Allison Aka, MD appears in the CMS NPPES registry as a Colon & Rectal Surgery Physician provider holding MD credentials at 11175 CAMPUS STREET, Loma Linda, CA, 92350, with a listed phone of (909) 651-5948. NPI 1891130100 was issued on 05/01/2013.
Medicare Part D records for calendar year 2023 show 140 prescription claims written by this provider, covering 58 Medicare beneficiaries and totaling roughly $248K in drug spend, split 12% brand-name and 88% generic by claim count, with an opioid prescribing rate of 11.4%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 85.2/100 for the 2023 performance year (Quality 71.8, Cost 64.5), compared with the national average of 83.1.
Colon & Rectal Surgery Physician is a narrow specialty nationwide, with 1,608 enrolled providers across 50 states and an average of 196 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
Provider Details
| NPI | 1891130100 |
|---|---|
| Specialty | Colon & Rectal Surgery Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 05/01/2013 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
85.186
Final Score
Avg: 83.1
71.8166
Quality
64.5435
Cost
82
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Allison Aka, 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.
Faculty Physicians And Surgeons OF Llusm
Loma Linda, 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).
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 Allison Aka, MD. To verify Allison Aka, MD'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
Allison Aka, MD - brand share 12.0%
Colon & Rectal Surgery Physician average
12% brand-name claims vs 88% generic, on 140 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.
140
Total Claims
$248K
Total Drug Cost
58
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 143
- Total Day Supply
- 1,333
- Brand vs Generic
- 12% brand / 88% generic
- Brand Drug Cost
- $246K
- Generic Drug Cost
- $2K
- Opioid Claims
- 16 (11.4% rate)
- Antibiotic Claims
- 40
Patient Demographics
- Average Patient Age
- 70.8 years
- Avg HCC Risk Score
- 2.52
- Gender Split
- 66% female / 34% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Allison Aka, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Metronidazole
Metronidazole
19 claims
- Methocarbamol
Methocarbamol
17 claims
- Neomycin Sulfate
Neomycin Sulfate
17 claims
| Drug | Claims |
|---|---|
| Metronidazole | 19 |
| Methocarbamol | 17 |
| Neomycin Sulfate | 17 |
| Gavilyte-G "Peg3350/Sod Sulf | N/A |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Colon & Rectal Surgery Physician Overview
How Allison Aka, MD fits within the Colon & Rectal Surgery Physician landscape nationally.
1,608
Colon & Rectal Surgery Physician Providers in US
50
States with Colon & Rectal Surgery Physician
196
Avg Claims per Provider
Allison Aka, MD's 140 claims are below the specialty average of 196.
Nearby Colon & Rectal Surgery Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Aka.
Dr. Kenneth Aaron
M.D.
Newport Beach, CA
Dr. Michael Abel
M.D.
San Francisco, CA
Dr. Piyush Aggarwal
MD
Walnut Creek, CA
Dr. Ahmed Alkoraishi
MD
Hayward, CA
Dr. Robert Allen
MD
Santa Cruz, CA
Compare Colon & Rectal Surgery Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Colon & Rectal Surgery Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Allison Aka, MD's specialty? ▼
Allison Aka, MD specializes in Colon & Rectal Surgery Physician and practices in Loma Linda, California. Credentials: MD.
How much does Allison Aka, MD prescribe under Medicare Part D? ▼
In 2023, Allison Aka, MD wrote 140 Medicare Part D claims totaling $248K in drug costs for 58 beneficiaries.
What is Allison Aka, MD's Medicare quality score? ▼
Allison Aka, MD has a CMS MIPS Final Score of 85.2/100 (Quality: 71.8, Cost: 64.5). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Allison Aka, MD located? ▼
Allison Aka, MD is located at 11175 CAMPUS STREET, Loma Linda, CA, 92350. Phone: (909) 651-5948.
What is Allison Aka, MD's NPI number? ▼
Allison Aka, MD's National Provider Identifier (NPI) is 1891130100, issued on 05/01/2013.
Does Allison Aka, MD prescribe more brand-name or generic drugs? ▼
Allison Aka, MD's prescribing is 12% brand-name and 88% generic drugs by claim count, with $246K in brand drug costs.
Does Allison Aka, MD prescribe opioids? ▼
Yes, Allison Aka, MD had 16 opioid claims in 2023 with an opioid prescribing rate of 11.4%.
How many Colon & Rectal Surgery Physician providers are there in the US? ▼
There are 1,608 Colon & Rectal Surgery Physician providers across 50 states in the US. The average Colon & Rectal Surgery Physician provider writes 196 Medicare Part D claims per year.
What drugs does Allison Aka, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Allison Aka, MD's most frequently prescribed drugs include Metronidazole, Methocarbamol, Neomycin Sulfate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Allison Aka, MD accept Medicare? ▼
Allison Aka, MD appears in CMS Medicare data with 140 Part D claims and 58 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Allison Aka, MD's credentials? ▼
Allison Aka, MD's NPI is 1891130100 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 (2023). 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 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
Compiled from official public sources by the PlainDoctor editorial team.