MS. KARLA L BIRKHOLZ MD
Prescription History 1386620821
Family Medicine in Glendale, AZ

Active since December 16, 2005Opted out of Medicare · through Sep 1, 2027
6320 W UNION HILLS DR, B2300, GLENDALE, AZ 85308(623) 561-9913(623) 561-6148 Get Directions

NPPES record last updated: September 24, 2013. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Medicare Part D Prescription History

Explore the verified Medicare Part D prescription history, volume metrics, and calculated drug costs for MS. KARLA L BIRKHOLZ MD, an active Family Medicine specialist practicing in Glendale, AZ. Our medical registry currently tracks 13 unique pharmaceutical formulations prescribed by this provider, representing an estimated volume of 270 documented patient claims. Among these therapy options, the most frequently utilized medication is Oxycodone Hcl, which accounts for 50 claims alone. Use the table below to sort by claims, cost, or utilization compared with the state average; select any medication for its full profile.

13
Medications
270
Total Claims
421
30-Day Fills
Oxycodone Hcl
Most Prescribed · 50 claims
View details
13 medications · 2023 Medicare Part D
Medicare Part D medications prescribed by MS. KARLA L BIRKHOLZ MD in 2023, with prescription volumes, average cost per fill, and AZ state comparisons
Medication Prescriptions (2023)Rx (2023) Avg Cost per FillCost / Fill Vs. Other AZ PrescribersVs. AZ Avg

About Oxycodone Hcl: This medication is used to help relieve moderate to severe pain. Show more ▾

Oxycodone belongs to a class of drugs known as opioid analgesics. It works in the brain to change how your body feels and responds to pain. A semisynthetic derivative of CODEINE.

In 2023, this provider wrote 50 Medicare prescriptions for Oxycodone Hcl, about 68% of the volume of the typical Arizona prescriber of this medication (74). Medicare paid an average of $31.55 per fill, versus $26.60 statewide.

How often this provider prescribes it

This provider
50
AZ average
74.0

This provider prescribes this medication less often than the average AZ prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$31.55
AZ average
$26.60

Gross Part D cost per fill; not the patient's out-of-pocket price.

50
30-Day Fills
standardized to 30-day supplies
1,129
Days of Medication
total across all patients in 2023

About Tramadol Hcl: See also Warning section. Show more ▾

This medication is used to help relieve moderate to moderately severe pain. Tramadol belongs to a class of drugs known as opioid analgesics. It works in the brain to change how your body feels and responds to pain. A narcotic analgesic proposed for severe pain. It may be habituating.

In 2023, this provider wrote 43 Medicare prescriptions for Tramadol Hcl, about 90% of the volume of the typical Arizona prescriber of this medication (48). Medicare paid an average of $12.38 per fill, versus $8.49 statewide.

How often this provider prescribes it

This provider
43
AZ average
48.0

This provider's prescribing volume for this medication is in line with the average AZ prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$12.38
AZ average
$8.49

Gross Part D cost per fill; not the patient's out-of-pocket price.

43
30-Day Fills
standardized to 30-day supplies
1,067
Days of Medication
total across all patients in 2023

About Progesterone: This medication is used to treat infertility in women who do not make enough of a certain natural hormone called progesterone. Show more ▾

This hormone is needed to maintain pregnancy. This medication is also used to restore menstrual cycles in women whose cycles have stopped. Progesterone is needed to keep menstrual periods regular.

In 2023, this provider wrote 25 Medicare prescriptions for Progesterone, about the same volume as the typical Arizona prescriber of this medication (27). Medicare paid an average of $130.57 per fill, versus $69.97 statewide.

How often this provider prescribes it

This provider
25
AZ average
27.0

This provider's prescribing volume for this medication is in line with the average AZ prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$130.57
AZ average
$69.97

Gross Part D cost per fill; not the patient's out-of-pocket price.

69.6
30-Day Fills
standardized to 30-day supplies
2,090
Days of Medication
total across all patients in 2023

About Estradiol: This medication is a female hormone (estrogen). Show more ▾

It is used by women to help reduce symptoms of menopause (such as hot flashes, vaginal dryness). These symptoms are caused by the body making less estrogen. If you are using this medication to treat symptoms only in and around the vagina, products applied directly inside the vagina should be considered before medications that are taken by mouth, absorbed through the skin, or injected. This medication may also be used by women who are not able to produce enough estrogen (for example, due to hypogonadism, primary ovarian failure). Certain estrogen products may also be used by women after menopause to prevent bone loss (osteoporosis). However, there are other medications (such as raloxifene, bisphosphonates including alendronate) that are also effective in preventing bone loss and may be safer. These medications should be considered for use before estrogen treatment. The 17-beta-isomer of estradiol, an aromatized C18 steroid with hydroxyl group at 3-beta- and 17-beta-position. Estradiol-17-beta is the most potent form of mammalian estrogenic steroids.

In 2023, this provider wrote 24 Medicare prescriptions for Estradiol, about 73% of the volume of the typical Arizona prescriber of this medication (33). Medicare paid an average of $26.97 per fill, versus $61.29 statewide.

How often this provider prescribes it

This provider
24
AZ average
33.0

This provider prescribes this medication less often than the average AZ prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$26.97
AZ average
$61.29

This provider's average cost per fill is below the AZ average for this medication.

68.6
30-Day Fills
standardized to 30-day supplies
2,058
Days of Medication
total across all patients in 2023

About Cyclobenzaprine Hcl: Cyclobenzaprine is used short-term to treat muscle spasms. Show more ▾

It is usually used along with rest and physical therapy. It works by helping to relax the muscles. This medication is not recommended for use in older adults because they may be at greater risk for side effects while using this drug. Ask the doctor or pharmacist for details.

In 2023, this provider wrote 20 Medicare prescriptions for Cyclobenzaprine Hcl, about 61% of the volume of the typical Arizona prescriber of this medication (33). Medicare paid an average of $6.51 per fill, versus $14.49 statewide.

How often this provider prescribes it

This provider
20
AZ average
33.0

This provider prescribes this medication less often than the average AZ prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$6.51
AZ average
$14.49

This provider's average cost per fill is below the AZ average for this medication.

20
30-Day Fills
standardized to 30-day supplies
530
Days of Medication
total across all patients in 2023

About Hydrocodone-Acetaminophen: This combination medication is used to relieve moderate to severe pain. Show more ▾

It contains an opioid pain reliever (hydrocodone) and a non-opioid pain reliever (acetaminophen). Hydrocodone works in the brain to change how your body feels and responds to pain. Acetaminophen can also reduce a fever.

In 2023, this provider wrote 20 Medicare prescriptions for Hydrocodone-Acetaminophen, about a third of the volume of the typical Arizona prescriber of this medication (69). Medicare paid an average of $32.41 per fill, versus $20.80 statewide.

How often this provider prescribes it

This provider
20
AZ average
69.0

This provider prescribes this medication less often than the average AZ prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$32.41
AZ average
$20.80

Gross Part D cost per fill; not the patient's out-of-pocket price.

24
30-Day Fills
standardized to 30-day supplies
531
Days of Medication
total across all patients in 2023

About Metformin Hcl Er: Metformin is used with a proper diet and exercise program and possibly with other medications to control high blood sugar. Show more ▾

It is used in patients with type 2 diabetes. Controlling high blood sugar helps prevent kidney damage, blindness, nerve problems, loss of limbs, and sexual function problems. Proper control of diabetes may also lessen your risk of a heart attack or stroke. Metformin works by helping to restore your body's proper response to the insulin you naturally produce. It also decreases the amount of sugar that your liver makes and that your stomach/intestines absorb. A biguanide hypoglycemic agent used in the treatment of non-insulin-dependent diabetes mellitus not responding to dietary modification. Metformin improves glycemic control by improving insulin sensitivity and decreasing intestinal absorption of glucose. (From Martindale, The Extra Pharmacopoeia, 30th ed, p289)

In 2023, this provider wrote 15 Medicare prescriptions for Metformin Hcl Er, about a third of the volume of the typical Arizona prescriber of this medication (43). Medicare paid an average of $11.69 per fill, versus $11.77 statewide.

How often this provider prescribes it

This provider
15
AZ average
43.0

This provider prescribes this medication less often than the average AZ prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$11.69
AZ average
$11.77

This provider's average cost per fill is below the AZ average for this medication.

43
30-Day Fills
standardized to 30-day supplies
1,290
Days of Medication
total across all patients in 2023

About Zolpidem Tartrate: Zolpidem is used for a short time to treat a certain sleep problem (insomnia) in adults. Show more ▾

If you have trouble falling asleep, it helps you fall asleep faster, so you can get a better night's rest. Zolpidem belongs to a class of drugs called sedative-hypnotics. It acts on your brain to produce a calming effect. An imidazopyridine derivative and short-acting GABA-A receptor agonist that is used for the treatment of INSOMNIA.

In 2023, this provider wrote 15 Medicare prescriptions for Zolpidem Tartrate, about a third of the volume of the typical Arizona prescriber of this medication (40). Medicare paid an average of $2.77 per fill, versus $9.22 statewide.

How often this provider prescribes it

This provider
15
AZ average
40.0

This provider prescribes this medication less often than the average AZ prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$2.77
AZ average
$9.22

This provider's average cost per fill is below the AZ average for this medication.

15
30-Day Fills
standardized to 30-day supplies
450
Days of Medication
total across all patients in 2023

About Levothyroxine Sodium: Levothyroxine is used to treat an underactive thyroid (hypothyroidism). Show more ▾

It replaces or provides more thyroid hormone, which is normally produced by the thyroid gland. Low thyroid hormone levels can occur naturally or when the thyroid gland is injured by radiation/medications or removed by surgery. Having enough thyroid hormone is important for maintaining normal mental and physical activity. In children, having enough thyroid hormone is important for normal mental and physical development. This medication is also used to treat other types of thyroid disorders (such as thyroid cancer). This medication should not be used to treat infertility unless it is caused by low thyroid hormone levels. The major hormone derived from the thyroid gland. Thyroxine is synthesized via the iodination of tyrosines (MONOIODOTYROSINE) and the coupling of iodotyrosines (DIIODOTYROSINE) in the THYROGLOBULIN. Thyroxine is released from thyroglobulin by proteolysis and secreted into the blood. Thyroxine is peripherally deiodinated to form TRIIODOTHYRONINE which exerts a broad spectrum of stimulatory effects on cell metabolism.

In 2023, this provider wrote 13 Medicare prescriptions for Levothyroxine Sodium, about 9% of the volume of the typical Arizona prescriber of this medication (150). Medicare paid an average of $14.27 per fill, versus $16.89 statewide.

How often this provider prescribes it

This provider
13
AZ average
150.0

This provider prescribes this medication less often than the average AZ prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$14.27
AZ average
$16.89

This provider's average cost per fill is below the AZ average for this medication.

39
30-Day Fills
standardized to 30-day supplies
1,170
Days of Medication
total across all patients in 2023

About Temazepam: This medication is used to treat a certain sleep problem (insomnia). Show more ▾

It may help you fall asleep faster, stay asleep longer, and lessen how often you wake up during the night, so you can get a better night's rest. Temazepam belongs to a class of drugs called benzodiazepines. It acts on your brain to produce a calming effect. Use of this medication is usually limited to short treatment periods of 1 to 2 weeks or less. If your insomnia continues for a longer time, talk to your doctor to see if you need other treatment. A benzodiazepine that acts as a GAMMA-AMINOBUTYRIC ACID modulator and anti-anxiety agent.

In 2023, this provider wrote 12 Medicare prescriptions for Temazepam, about half the volume of the typical Arizona prescriber of this medication (24). Medicare paid an average of $8.87 per fill, versus $14.09 statewide.

How often this provider prescribes it

This provider
12
AZ average
24.0

This provider prescribes this medication less often than the average AZ prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$8.87
AZ average
$14.09

This provider's average cost per fill is below the AZ average for this medication.

12
30-Day Fills
standardized to 30-day supplies
360
Days of Medication
total across all patients in 2023

About Clonidine: This medication is used alone or with other medications to treat high blood pressure (hypertension). Show more ▾

Lowering high blood pressure helps prevent strokes, heart attacks, and kidney problems. Clonidine belongs to a class of drugs (central alpha agonists) that act in the brain to lower blood pressure. It works by relaxing blood vessels so blood can flow more easily. An imidazoline sympatholytic agent that stimulates ALPHA-2 ADRENERGIC RECEPTORS and central IMIDAZOLINE RECEPTORS. It is commonly used in the management of HYPERTENSION.

In 2023, this provider wrote 11 Medicare prescriptions for Clonidine, about half the volume of the typical Arizona prescriber of this medication (19). Medicare paid an average of $114.72 per fill, versus $175.04 statewide.

How often this provider prescribes it

This provider
11
AZ average
19.0

This provider prescribes this medication less often than the average AZ prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$114.72
AZ average
$175.04

This provider's average cost per fill is below the AZ average for this medication.

14.6
30-Day Fills
standardized to 30-day supplies
420
Days of Medication
total across all patients in 2023

About Hydroxyzine Hcl: Hydroxyzine is used to treat itching caused by allergies. Show more ▾

It is an antihistamine and works by blocking a certain natural substance (histamine) that your body makes during an allergic reaction. Hydroxyzine may also be used short-term to treat anxiety or to help you feel sleepy/relaxed before and after surgery.

In 2023, this provider wrote 11 Medicare prescriptions for Hydroxyzine Hcl, about a third of the volume of the typical Arizona prescriber of this medication (30). Medicare paid an average of $55.15 per fill, versus $21.61 statewide.

How often this provider prescribes it

This provider
11
AZ average
30.0

This provider prescribes this medication less often than the average AZ prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$55.15
AZ average
$21.61

Gross Part D cost per fill; not the patient's out-of-pocket price.

11
30-Day Fills
standardized to 30-day supplies
255
Days of Medication
total across all patients in 2023

About Tizanidine Hcl: This medication is used to treat muscle spasms caused by certain conditions (such as multiple sclerosis, spinal cord injury). Show more ▾

It works by helping to relax the muscles.

In 2023, this provider wrote 11 Medicare prescriptions for Tizanidine Hcl, about a quarter of the volume of the typical Arizona prescriber of this medication (47). Medicare paid an average of $19.58 per fill, versus $16.85 statewide.

How often this provider prescribes it

This provider
11
AZ average
47.0

This provider prescribes this medication less often than the average AZ prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$19.58
AZ average
$16.85

Gross Part D cost per fill; not the patient's out-of-pocket price.

11
30-Day Fills
standardized to 30-day supplies
330
Days of Medication
total across all patients in 2023
No medications match the current filters.
= the 5 medications this provider prescribes most. More than typical Typical Less than typical= prescription volume vs the average AZ prescriber of the same medication; volume reflects practice size as well as clinical preference.Green cost= below the AZ average cost per fill.

About this data. The prescription history for MS. KARLA L BIRKHOLZ MD is compiled from the Centers for Medicare & Medicaid Services (CMS) Medicare Part D Prescriber Public Use File for calendar year 2023, the most recent federal release. Figures cover prescriptions filled for Medicare Part D beneficiaries only; prescriptions under private insurance, Medicaid, or self-pay plans are not included. Because prescribing decisions are generally consistent across coverage types, this record offers a useful view of the overall Family Medicine prescribing approach at this Glendale, AZ practice.

Reading the costs. Drug costs are gross amounts paid to pharmacies under Part D, including both plan and beneficiary payments. They are not the price a patient pays at the pharmacy counter. Medications with fewer than 11 claims are excluded from the federal source data, and state comparisons use the average volume among AZ prescribers of the same medication. Always confirm current medications and costs directly with the provider and your plan.