NPI registry status
Active
2026 NPPES data Midwife NPI 1578504197 N.D.
Verify on CMS → Katherine Zieman, N.D.
Midwife in Gresham, Oregon.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 6,057 in Midwife, 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
81
Medicare Part D claims · 12 beneficiaries · Midwife avg: 112
Generic prescribing
80%
generic claims · 20% 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
Katherine Zieman, N.D. filed 81 Medicare Part D claims in 2024 as a Midwife in Gresham, Oregon, prescribing 80% generic.
- 81
- Part D claims, 2024
- 80%
- 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 Katherine Zieman, N.D.
Bare NPI registry listing — limited federal enrichment beyond basic enumeration. Verify all credentials with official sources.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1578504197), first enumerated 06/08/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 81 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- 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 1578504197 · Midwife
NPI-10 · ENUM-LEGACY · TAX-MID · RX-TRACE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1578504197
- ENUM-LEGACY 2006
- TAX-MID 6K Midwife
- RX-TRACE 81
- BOOK-THIN 192 in Oregon
- PHOTO-ENUM Gwen McCormick, CNM · 2006
Katherine Zieman, N.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
81 ≥ 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
What does the federal data show about Katherine Zieman, N.D.?
Quality data not reportedPrimary specialty
Midwife
Medicare Part D claims
81 28% vs specialty avg
Specialty distribution in Oregon
How Midwife compares to other specialties among Oregon 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 Midwife. 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 | 1578504197 |
|---|---|
| Specialty | Midwife |
| Credentials | N.D. |
| Gender | Female |
| NPI Issued | 06/08/2006 |
Brand vs generic prescribing mix · Typical
Katherine Zieman, N.D. - brand share 20.0%
Midwife average
20% brand-name claims vs 80% generic, on 81 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.
81
Total Claims
$2K
Total Drug Cost
12
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 123.6
- Total Day Supply
- 3,393
- Brand vs Generic
- 20% brand / 80% generic
- Brand Drug Cost
- $189
- Generic Drug Cost
- $2K
Patient Demographics
- Average Patient Age
- 62.1 years
- Avg HCC Risk Score
- 0.52
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Katherine Zieman, N.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Estradiol (Twice W…
Estradiol (Twice Weekly)
19 claims
- Levothyroxine Sodium
Levothyroxine Sodium
18 claims
- Acyclovir
Acyclovir
13 claims
- Fluoxetine Hcl
Fluoxetine Hcl
11 claims
| Drug | Claims |
|---|---|
| Estradiol (Twice Weekly) Estradiol | 19 |
| Levothyroxine Sodium | 18 |
| Acyclovir | 13 |
| Fluoxetine Hcl | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Midwife Overview
How Katherine Zieman, N.D. fits within the Midwife landscape nationally.
6,057
Midwife Providers in US
54
States with Midwife
112
Avg Claims per Provider
Katherine Zieman, N.D.'s 81 claims are below the specialty average of 112.
Nationwide Midwife peers with similar MIPS or enrollment year
Two federal-record peer sets for Zieman, both outside Oregon 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 Midwife Providers in Oregon
Other clinicians with the same primary specialty enrolled in Oregon, drawn from the same CMS NPPES roster as Zieman.
One of 192 Midwife providers enrolled in Oregon, 5 are shown here.
Silke Akerson
L.D.M, C.P.M.
Portland, OR
Liliana Alcantara-Barrios
Portland, OR
Aliaja Allison
LM, CPM
Portland, OR
Tracy Amonoo
NP, CNM
Coos Bay, OR
Laura Anderson
CPM LDM
Portland, OR
Compare Midwife nationally: see state-by-state distribution →
Frequently Asked Questions
What is Katherine Zieman, N.D.'s specialty? ▼
Katherine Zieman, N.D. specializes in Midwife and practices in Gresham, Oregon. Credentials: N.D..
How much does Katherine Zieman, N.D. prescribe under Medicare Part D? ▼
In 2024, Katherine Zieman, N.D. wrote 81 Medicare Part D claims totaling $2K in drug costs for 12 beneficiaries.
Where is Katherine Zieman, N.D. located? ▼
Katherine Zieman, N.D. is located at 22400 SE STARK ST STE 105, Gresham, OR, 97030. Phone: (503) 492-1221.
What is Katherine Zieman, N.D.'s NPI number? ▼
Katherine Zieman, N.D.'s National Provider Identifier (NPI) is 1578504197, issued on 06/08/2006.
Does Katherine Zieman, N.D. prescribe more brand-name or generic drugs? ▼
Katherine Zieman, N.D.'s prescribing is 20% brand-name and 80% generic drugs by claim count, with $189 in brand drug costs.
How many Midwife providers are there in the US? ▼
There are 6,057 Midwife providers across 54 states in the US. The average Midwife provider writes 112 Medicare Part D claims per year.
What drugs does Katherine Zieman, N.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Katherine Zieman, N.D.'s most frequently prescribed drugs include Estradiol (Twice Weekly), Levothyroxine Sodium, Acyclovir. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Katherine Zieman, N.D. accept Medicare? ▼
Katherine Zieman, N.D. appears in CMS Medicare data with 81 Part D claims and 12 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Katherine Zieman, N.D.'s credentials? ▼
Katherine Zieman, N.D.'s NPI is 1578504197 with credentials N.D.. 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.