2026 NPPES data Behavioral Neurology & Neuropsychiatry Physician NPI 1538593165 MD
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SANDRA COMBS, MD

Behavioral Neurology & Neuropsychiatry Physician in TUCSON, Arizona. 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
517
Medicare Part D claims · 63 beneficiaries · Behavioral Neurology & Neuropsychiatry Physician avg: 804
Generic prescribing
97%
generic claims · 3% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

SANDRA COMBS, MD filed 517 Medicare Part D claims in 2023 as a Behavioral Neurology & Neuropsychiatry Physician in TUCSON, Arizona, prescribing 97% generic.

517
Part D claims, 2023
97%
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.

SANDRA COMBS, MD's Medicare Part D volume vs every U.S. prescriber

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

517 Top 34% higher than 66% 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%). This entry sits in this band. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. 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

Board certification likely (heuristic — not verified)

SANDRA COMBS, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 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 SANDRA COMBS, MD?

Quality data not reported

NPI registry status

Active

Issued 08/30/2013

NPI 1538593165

Primary specialty

Behavioral Neurology & Neuropsychiatry Physician

Rare

268 US NPIs in this specialty

Medicare Part D claims

517 36% vs specialty avg

2023 prescription claims

Specialty avg: 804

Specialty distribution in Arizona

How Behavioral Neurology & Neuropsychiatry Physician compares to other specialties among Arizona providers

Arizona providers

Behavioral Neurology & Neuropsychiatry Physician share within Arizona

1. Behavioral Neurology & Neuropsychiatry Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Behavioral Neurology & Neuropsychiatry Physician share within Arizona

Specialty board-certification context

Estimated specialty board-certified rate — Behavioral Neurology & Neuropsychiatry Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Behavioral Neurology & Neuropsychiatry Physician ABMS/AOA estimate

Est. board-certified rate (Behavioral Neurology & Neuropsychiatry Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Behavioral Neurology & Neuropsychiatry Physician) — 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).

SANDRA COMBS, MD appears in the CMS NPPES registry as a Behavioral Neurology & Neuropsychiatry Physician provider holding MD credentials at 839 W CONGRESS ST, TUCSON, AZ, 85745, with a listed phone of (520) 670-3909. NPI 1538593165 was issued on 08/30/2013. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what COMBS 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 517 prescription claims written by this provider, covering 63 Medicare beneficiaries and totaling roughly $36K in drug spend, split 3% brand-name and 97% generic by claim count. 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.

Behavioral Neurology & Neuropsychiatry Physician is a narrow specialty nationwide, with 268 enrolled providers across 43 states and an average of 804 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

839 W CONGRESS ST
TUCSON, AZ 85745

Provider Details

NPI 1538593165
Specialty Behavioral Neurology & Neuropsychiatry Physician
Credentials MD
Gender Female
NPI Issued 08/30/2013

Hospital and facility affiliations

Facilities where SANDRA COMBS, 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.

EL RIO SANTA CRUZ NEIGHBORHOOD HEALTH CENTER INC
TUCSON, AZ

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

Brand vs generic prescribing mix · Generic-heavy

SANDRA COMBS, MD — brand share 3.0%
Specialty average (est.)

3% brand-name claims vs 97% generic, on 517 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.

517
Total Claims
$36K
Total Drug Cost
63
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
1,179
Total Day Supply
35,161
Brand vs Generic
3% brand / 97% generic
Brand Drug Cost
$10K
Generic Drug Cost
$26K

Patient Demographics

Average Patient Age
63.7 years
Avg HCC Risk Score
1.11
Gender Split
68% female / 32% male
Age Distribution
<65: 29, 65-74: 26, 75-84: N/A, 85+: N/A

Top Prescribed Drugs (Medicare Part D)

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

What SANDRA COMBS, MD 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
Lamotrigine
47
Mirtazapine
47
Duloxetine Hcl
38
Fluoxetine Hcl
38
Bupropion Xl
Bupropion Hcl
31
Trazodone Hcl
31
Aripiprazole
24
Venlafaxine Hcl Er
Venlafaxine Hcl
22
Escitalopram Oxalate
19
Gabapentin
19

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

Behavioral Neurology & Neuropsychiatry Physician Overview

How SANDRA COMBS, MD fits within the Behavioral Neurology & Neuropsychiatry Physician landscape nationally.

268
Behavioral Neurology & Neuropsychiatry Physician Providers in US
43
States with Behavioral Neurology & Neuropsychiatry Physician
804
Avg Claims per Provider

SANDRA COMBS, MD's 517 claims are below the specialty average of 804.

Nearby Behavioral Neurology & Neuropsychiatry Physician Providers in Arizona

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

Compare Behavioral Neurology & Neuropsychiatry Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is SANDRA COMBS, MD's specialty?
SANDRA COMBS, MD specializes in Behavioral Neurology & Neuropsychiatry Physician and practices in TUCSON, Arizona. Credentials: MD.
How much does SANDRA COMBS, MD prescribe under Medicare Part D?
In 2023, SANDRA COMBS, MD wrote 517 Medicare Part D claims totaling $36K in drug costs for 63 beneficiaries.
Where is SANDRA COMBS, MD located?
SANDRA COMBS, MD is located at 839 W CONGRESS ST, TUCSON, AZ, 85745. Phone: (520) 670-3909.
What is SANDRA COMBS, MD's NPI number?
SANDRA COMBS, MD's National Provider Identifier (NPI) is 1538593165, issued on 08/30/2013.
Does SANDRA COMBS, MD prescribe more brand-name or generic drugs?
SANDRA COMBS, MD's prescribing is 3% brand-name and 97% generic drugs by claim count, with $10K in brand drug costs.
How many Behavioral Neurology & Neuropsychiatry Physician providers are there in the US?
There are 268 Behavioral Neurology & Neuropsychiatry Physician providers across 43 states in the US. The average Behavioral Neurology & Neuropsychiatry Physician provider writes 804 Medicare Part D claims per year.
What drugs does SANDRA COMBS, MD prescribe most often?
Based on 2023 Medicare Part D data, SANDRA COMBS, MD's most frequently prescribed drugs include Lamotrigine, Mirtazapine, Duloxetine Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does SANDRA COMBS, MD accept Medicare?
SANDRA COMBS, MD appears in CMS Medicare data with 517 Part D claims and 63 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify SANDRA COMBS, MD's credentials?
SANDRA COMBS, MD's NPI is 1538593165 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

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