NATHAN JAMES WALKER PA
Prescription History 1013790021
Physician Assistant in Santa Maria, CA
What does Nathan Walker prescribe?
In 2024, Nathan Walker wrote 2,189 Medicare prescriptions for 41 medications. The most prescribed was Lorazepam, with 234 prescriptions for 65 patients.
Medicare Part D only. These are prescriptions filled by people with Medicare drug coverage in 2024, from the CMS data released in 2026, the most recent year available. CMS does not publish medications with fewer than 11 prescriptions, so this is not a full list of what Nathan Walker prescribes.
Medications 41 medications
Prescriptions filled under Medicare Part D in 2024. Select a medication to see what it is used for and how it compares with other California prescribers.
What it is used for
This medication is used to treat anxiety.
Compared with California prescribers
Nathan Walker wrote 234 prescriptions for Lorazepam, about 5.4 times as often as the typical California prescriber of it (43). Medicare paid $6.53 per fill, versus $6.52 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Clonazepam is used to prevent and control seizures.
Compared with California prescribers
Nathan Walker wrote 214 prescriptions for Clonazepam, about 5.3 times as often as the typical California prescriber of it (40). Medicare paid $4.16 per fill, versus $7.09 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain mental/mood disorders (such as schizophrenia, bipolar disorder, sudden episodes of mania or depression associated with bipolar disorder).
Compared with California prescribers
Nathan Walker wrote 148 prescriptions for Quetiapine Fumarate, about 2.7 times as often as the typical California prescriber of it (55). Medicare paid $21.69 per fill, versus $19.69 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat depression.
Compared with California prescribers
Nathan Walker wrote 141 prescriptions for Trazodone Hcl, about 2.5 times as often as the typical California prescriber of it (57). Medicare paid $9.52 per fill, versus $9.93 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain mental/mood disorders (such as depression, panic attacks, obsessive compulsive disorder, post-traumatic stress disorder, social anxiety disorder).
Compared with California prescribers
Nathan Walker wrote 111 prescriptions for Sertraline Hcl, about 2.4 times as often as the typical California prescriber of it (46). Medicare paid $5.93 per fill, versus $9.59 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain mental/mood disorders (such as schizophrenia, bipolar disorder).
Compared with California prescribers
Nathan Walker wrote 100 prescriptions for Olanzapine, about 1.9 times as often as the typical California prescriber of it (52). Medicare paid $15.13 per fill, versus $24.98 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Lamotrigine is used alone or with other medications to prevent and control seizures.
Compared with California prescribers
Nathan Walker wrote 98 prescriptions for Lamotrigine, about 2.5 times as often as the typical California prescriber of it (39). Medicare paid $10.04 per fill, versus $14.45 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain mental/mood disorders (such as depression, panic attacks, obsessive compulsive disorder).
Compared with California prescribers
Nathan Walker wrote 71 prescriptions for Fluoxetine Hcl, about 2.1 times as often as the typical California prescriber of it (33). Medicare paid $4.58 per fill, versus $11.85 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Alprazolam is used to treat anxiety and panic disorders.
Compared with California prescribers
Nathan Walker wrote 68 prescriptions for Alprazolam, about 1.4 times as often as the typical California prescriber of it (50). Medicare paid $7.18 per fill, versus $5.37 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain mental/mood disorders (such as depression, anxiety).
Compared with California prescribers
Nathan Walker wrote 67 prescriptions for Duloxetine Hcl, about 1.7 times as often as the typical California prescriber of it (40). Medicare paid $22.12 per fill, versus $24.72 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Hydroxyzine is used to treat itching caused by allergies.
Compared with California prescribers
Nathan Walker wrote 65 prescriptions for Hydroxyzine Hcl, about 2.3 times as often as the typical California prescriber of it (28). Medicare paid $19.55 per fill, versus $13.85 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat depression.
Compared with California prescribers
Nathan Walker wrote 63 prescriptions for Mirtazapine, about 1.6 times as often as the typical California prescriber of it (40). Medicare paid $18.50 per fill, versus $19.05 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat anxiety.
Compared with California prescribers
Nathan Walker wrote 61 prescriptions for Buspirone Hcl, about 1.7 times as often as the typical California prescriber of it (37). Medicare paid $8.60 per fill, versus $13.30 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain mental/mood disorders (such as bipolar disorder, schizophrenia, Tourette's syndrome, and irritability associated with autistic disorder).
Compared with California prescribers
Nathan Walker wrote 51 prescriptions for Aripiprazole, about 1.2 times as often as the typical California prescriber of it (43). Medicare paid $38.91 per fill, versus $71.35 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Diazepam is used to treat anxiety, alcohol withdrawal, and seizures.
Compared with California prescribers
Nathan Walker wrote 47 prescriptions for Diazepam, about 1.9 times as often as the typical California prescriber of it (24). Medicare paid $5.06 per fill, versus $6.79 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Zolpidem is used for a short time to treat a certain sleep problem (insomnia) in adults.
Compared with California prescribers
Nathan Walker wrote 47 prescriptions for Zolpidem Tartrate, about as often as the typical California prescriber of it (45). Medicare paid $3.53 per fill, versus $6.02 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain mental/mood disorders (such as depression, anxiety).
Compared with California prescribers
Nathan Walker wrote 46 prescriptions for Escitalopram Oxalate, about as often as the typical California prescriber of it (48). Medicare paid $10.66 per fill, versus $11.14 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat depression.
Compared with California prescribers
Nathan Walker wrote 42 prescriptions for Bupropion Hcl Sr, about 1.8 times as often as the typical California prescriber of it (23). Medicare paid $14.34 per fill, versus $18.90 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat depression.
Compared with California prescribers
Nathan Walker wrote 42 prescriptions for Bupropion Xl, about 1.2 times as often as the typical California prescriber of it (35). Medicare paid $21.17 per fill, versus $25.68 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat seizure disorders, mental/mood conditions (such as manic phase of bipolar disorder), and to prevent migraine headaches.
Compared with California prescribers
Nathan Walker wrote 42 prescriptions for Divalproex Sodium Er, about as often as the typical California prescriber of it (37). Medicare paid $48.78 per fill, versus $51.64 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain mental/mood disorders (such as depression, anxiety, panic attacks, and social anxiety disorder).
Compared with California prescribers
Nathan Walker wrote 39 prescriptions for Venlafaxine Hcl Er, about 1.4 times as often as the typical California prescriber of it (28). Medicare paid $13.13 per fill, versus $23.92 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain mental/mood disorders (such as schizophrenia, bipolar disorder, irritability associated with autistic disorder).
Compared with California prescribers
Nathan Walker wrote 38 prescriptions for Risperidone, about 77% as often as the typical California prescriber of it (49). Medicare paid $18.53 per fill, versus $13.84 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain mental/mood disorders (such as schizophrenia, depression associated with bipolar disorder).
Compared with California prescribers
Nathan Walker wrote 37 prescriptions for Lurasidone Hcl, about 1.2 times as often as the typical California prescriber of it (32). Medicare paid $114.17 per fill, versus $292.84 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain mental/mood disorders (such as schizophrenia, bipolar disorder).
Compared with California prescribers
Nathan Walker wrote 35 prescriptions for Ziprasidone Hcl, about 1.3 times as often as the typical California prescriber of it (26). Medicare paid $69.36 per fill, versus $60.41 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This combination medication is used to treat attention deficit hyperactivity disorder - ADHD.
Compared with California prescribers
Nathan Walker wrote 33 prescriptions for Dextroamphetamine-Amphetamine, about 1.3 times as often as the typical California prescriber of it (26). Medicare paid $25.72 per fill, versus $28.60 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is a beta blocker used to treat high blood pressure, irregular heartbeats, shaking (tremors), and other conditions.
Compared with California prescribers
Nathan Walker wrote 28 prescriptions for Propranolol Hcl, about as often as the typical California prescriber of it (25). Medicare paid $20.61 per fill, versus $20.69 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Benztropine is used to treat symptoms of Parkinson's disease or involuntary movements due to the side effects of certain psychiatric drugs (antipsychotics such as chlorpromazine/haloperidol).
Compared with California prescribers
Nathan Walker wrote 26 prescriptions for Benztropine Mesylate, about half as often as the typical California prescriber of it (51). Medicare paid $12.22 per fill, versus $12.47 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Topiramate is used alone or with other medications to prevent and control seizures (epilepsy).
Compared with California prescribers
Nathan Walker wrote 19 prescriptions for Topiramate, about 65% as often as the typical California prescriber of it (29). Medicare paid $8.90 per fill, versus $13.46 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat depression.
Compared with California prescribers
Nathan Walker wrote 18 prescriptions for Amitriptyline Hcl, about 72% as often as the typical California prescriber of it (25). Medicare paid $15.05 per fill, versus $14.34 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat depression.
Compared with California prescribers
Nathan Walker wrote 17 prescriptions for Desvenlafaxine Succinate Er, about 70% as often as the typical California prescriber of it (24). Medicare paid $82.56 per fill, versus $62.60 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Gabapentin is used with other medications to prevent and control seizures.
Compared with California prescribers
Nathan Walker wrote 16 prescriptions for Gabapentin, about 20% as often as the typical California prescriber of it (80). Medicare paid $11.40 per fill, versus $15.63 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain mental/mood disorders (such as schizophrenia, schizoaffective disorders).
Compared with California prescribers
Nathan Walker wrote 16 prescriptions for Haloperidol, about half as often as the typical California prescriber of it (36). Medicare paid $28.65 per fill, versus $34.79 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat seizure disorders, certain psychiatric conditions (manic phase of bipolar disorder), and to prevent migraine headaches.
Compared with California prescribers
Nathan Walker wrote 15 prescriptions for Divalproex Sodium, about 31% as often as the typical California prescriber of it (48). Medicare paid $19.40 per fill, versus $38.94 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Oxcarbazepine is used alone or with other medications to treat seizure disorders (epilepsy).
Compared with California prescribers
Nathan Walker wrote 13 prescriptions for Oxcarbazepine, about half as often as the typical California prescriber of it (27). Medicare paid $40.47 per fill, versus $57.55 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat depression.
Compared with California prescribers
Nathan Walker wrote 12 prescriptions for Bupropion Hcl, about half as often as the typical California prescriber of it (20). Medicare paid $29.63 per fill, versus $23.39 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Hydroxyzine is used to treat itching caused by allergies.
Compared with California prescribers
Nathan Walker wrote 12 prescriptions for Hydroxyzine Pamoate, about half as often as the typical California prescriber of it (29). Medicare paid $7.45 per fill, versus $10.86 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain mental/mood disorders (such as depression, panic attacks, obsessive compulsive disorder, anxiety disorders, post-traumatic stress disorder).
Compared with California prescribers
Nathan Walker wrote 12 prescriptions for Paroxetine Hcl, about half as often as the typical California prescriber of it (25). Medicare paid $7.58 per fill, versus $12.24 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Prazosin is used with or without other medications to treat high blood pressure.
Compared with California prescribers
Nathan Walker wrote 12 prescriptions for Prazosin Hcl, about half as often as the typical California prescriber of it (26). Medicare paid $10.28 per fill, versus $19.19 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used before eye examinations (such as refraction) and to treat certain eye conditions (such as uveitis).
Compared with California prescribers
Nathan Walker wrote 11 prescriptions for Atropine Sulfate, about half as often as the typical California prescriber of it (25). Medicare paid $52.03 per fill, versus $37.90 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat depression.
Compared with California prescribers
Nathan Walker wrote 11 prescriptions for Citalopram Hbr, about 37% as often as the typical California prescriber of it (30). Medicare paid $3.36 per fill, versus $8.24 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat manic-depressive disorder (bipolar disorder).
Compared with California prescribers
Nathan Walker wrote 11 prescriptions for Lithium Carbonate Er, about half as often as the typical California prescriber of it (21). Medicare paid $17.70 per fill, versus $18.09 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
Questions about Nathan Walker’s prescriptions
What does Nathan Walker prescribe most?
In 2024 Medicare Part D data, Nathan Walker's most prescribed medications were Lorazepam (234), Clonazepam (214) and Quetiapine Fumarate (148).
How does Nathan Walker's prescribing compare with other California prescribers?
Of the 41 medications with a state comparison, Nathan Walker prescribes 18 more often than the typical California prescriber, 8 about as often and 15 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Nathan Walker prescribes?
No. It covers prescriptions filled by people with Medicare Part D drug coverage in 2024, and CMS leaves out any medication with fewer than 11 prescriptions.
About this data
This page shows one provider’s slice of public Medicare files. NPI Profile does not receive prescriptions or patient records.
| Source | What it provides here | Data year |
|---|---|---|
| CMS Medicare Part D Prescribers by Provider and Drug | Each medication, prescriptions, patients, 30-day fills, days of medication and cost. State comparisons average the California prescribers of the same medication and form, where at least five wrote it. | 2024 (released 2026, the most recent available) |
| CMS Medicare Part D Drug Spending Dashboard | What each medication is used for. | 2024 |
- Only prescriptions filled by people with Medicare Part D drug coverage are counted. Private insurance, Medicaid and cash purchases are not.
- CMS leaves out medications with fewer than 11 prescriptions and hides patient counts under 11.
- Cost per fill is what the plan and the patient paid the pharmacy together, not what you pay at the counter.
- Medication descriptions are summaries from CMS. They are not medical advice; ask a health care professional about any medication.
