NPI registry status
Active
2026 NPPES data Endocrinology, Diabetes & Metabolism Physician NPI 1831385095 DO
Verify on CMS → Grace Sun, DO
Endocrinology, Diabetes & Metabolism Physician in Minneapolis, Minnesota.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 7,871 in Endocrinology, Diabetes & Metabolism 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
2K
Medicare Part D claims · 360 beneficiaries · Endocrinology, Diabetes & Metabolism Physician avg: 3K
Generic prescribing
68%
generic claims · 26% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Grace Sun, DO filed 1,604 Medicare Part D claims in 2023 as an Endocrinology, Diabetes & Metabolism Physician in Minneapolis, Minnesota, prescribing 68% generic.
- 2K
- Part D claims, 2023
- 68%
- generic prescribing
- ≥82nd
- 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.
CMS NPPES provider registry desk
NPI 1831385095 · Endocrinology, Diabetes & Metabolism Physician
NPI-10 · ENUM-MID · TAX-MID · RX-MID · BOOK-THIN · PHOTO-ENUM
- NPI-10 1831385095
- ENUM-MID 2007
- TAX-MID 8K Endocrinology, Diabetes
- RX-MID 1,604
- BOOK-THIN 141 in Minnesota
- PHOTO-ENUM Philip Otterbeck · 2007
Grace Sun, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,604 ≥ 82nd percentile 82% of 1,370,886 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 · 2023
◑
Board-eligible specialty (heuristic, not verified)
Grace Sun, DO 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 Grace Sun, DO?
Quality data not reportedPrimary specialty
Endocrinology, Diabetes & Metabolism Physician
Medicare Part D claims
1,604 39% vs specialty avg
Specialty distribution in Minnesota
How Endocrinology, Diabetes & Metabolism Physician compares to other specialties among Minnesota 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 Endocrinology, Diabetes & Metabolism 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 | 1831385095 |
|---|---|
| Specialty | Endocrinology, Diabetes & Metabolism Physician |
| Credentials | DO |
| Gender | Female |
| NPI Issued | 09/21/2007 |
Brand vs generic prescribing mix · Above average
Grace Sun, DO - brand share 26.0%
Endocrinology, Diabetes & Metabolism Physician average
26% brand-name claims vs 68% generic, on 1,604 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.
1,604
Total Claims
$583K
Total Drug Cost
360
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,747
- Total Day Supply
- 110,356
- Brand vs Generic
- 26% brand / 68% generic
- Brand Drug Cost
- $542K
- Generic Drug Cost
- $39K
Patient Demographics
- Average Patient Age
- 72.6 years
- Avg HCC Risk Score
- 1.22
- Gender Split
- 69% female / 31% male
- Age Distribution
- <65: 34, 65-74: 175, 75-84: 134, 85+: 17
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Grace Sun, DO prescribes most
Top Medicare Part D drugs by claim count, 2023
- Levothyroxine Sodium
Levothyroxine Sodium
435 claims
- Forteo 143
Forteo
143 claims
- Methimazole 130
Methimazole
130 claims
- Hydrocortisone 119
Hydrocortisone
119 claims
- Alendronate Sodium 94
Alendronate Sodium
94 claims
- Cinacalcet Hcl 53
Cinacalcet Hcl
53 claims
- Humalog 46
Humalog
46 claims
- Cabergoline 43
Cabergoline
43 claims
| Drug | Claims |
|---|---|
| Levothyroxine Sodium | 435 |
| Forteo Teriparatide | 143 |
| Methimazole | 130 |
| Hydrocortisone | 119 |
| Alendronate Sodium | 94 |
| Cinacalcet Hcl | 53 |
| Humalog Insulin Lispro | 46 |
| Cabergoline | 43 |
| Calcitriol | 34 |
| Fludrocortisone Acetate | 33 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Endocrinology, Diabetes & Metabolism Physician in MN →
All providers in Minnesota →
Compare specialties →
Endocrinology, Diabetes & Metabolism Physician Overview
How Grace Sun, DO fits within the Endocrinology, Diabetes & Metabolism Physician landscape nationally.
7,871
Endocrinology, Diabetes & Metabolism Physician Providers in US
54
States with Endocrinology, Diabetes & Metabolism Physician
2,639
Avg Claims per Provider
Grace Sun, DO's 1,604 claims are below the specialty average of 2,639.
Nationwide Endocrinology, Diabetes & Metabolism Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Sun, both outside Minnesota so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2007)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Endocrinology, Diabetes & Metabolism Physician Providers in Minnesota
Other clinicians with the same primary specialty enrolled in Minnesota, drawn from the same CMS NPPES roster as Sun.
One of 141 Endocrinology, Diabetes & Metabolism Physician providers enrolled in Minnesota, 5 are shown here.
Dr. Charles Abboud
MBBCH
Rochester, MN
Dr. Munir Abid
MD
Saint Paul, MN
Dr. Ammar Ahmed
MBBS, MSC
Minneapolis, MN
Dr. Mohammed Ahmed
MD
Coon Rapids, MN
Dr. Alaa Al Nofal
MD
Rochester, MN
Compare Endocrinology, Diabetes & Metabolism Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Grace Sun, DO's specialty? ▼
Grace Sun, DO specializes in Endocrinology, Diabetes & Metabolism Physician and practices in Minneapolis, Minnesota. Credentials: DO.
How much does Grace Sun, DO prescribe under Medicare Part D? ▼
In 2023, Grace Sun, DO wrote 1,604 Medicare Part D claims totaling $583K in drug costs for 360 beneficiaries.
Where is Grace Sun, DO located? ▼
Grace Sun, DO is located at 9513 AMERIPRISE FINANCIAL CENTER ROUTING: S-11-09513, Minneapolis, MN, 55474. Phone: (612) 678-1763.
What is Grace Sun, DO's NPI number? ▼
Grace Sun, DO's National Provider Identifier (NPI) is 1831385095, issued on 09/21/2007.
Does Grace Sun, DO prescribe more brand-name or generic drugs? ▼
Grace Sun, DO's prescribing is 26% brand-name and 68% generic drugs by claim count, with $542K in brand drug costs.
How many Endocrinology, Diabetes & Metabolism Physician providers are there in the US? ▼
There are 7,871 Endocrinology, Diabetes & Metabolism Physician providers across 54 states in the US. The average Endocrinology, Diabetes & Metabolism Physician provider writes 2,639 Medicare Part D claims per year.
What drugs does Grace Sun, DO prescribe most often? ▼
Based on 2023 Medicare Part D data, Grace Sun, DO's most frequently prescribed drugs include Levothyroxine Sodium, Forteo, Methimazole. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Grace Sun, DO accept Medicare? ▼
Grace Sun, DO appears in CMS Medicare data with 1,604 Part D claims and 360 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Grace Sun, DO's credentials? ▼
Grace Sun, DO's NPI is 1831385095 with credentials DO. 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.
- 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
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 May 2026.