CPT Code 00944: Anesthesia for vaginal hysterectomy

Key Takeaways

CPT Code 00944 describes anesthesia for vaginal hysterectomy within the parent section covering vaginal procedures including biopsy of the labia, vagina, cervix, or endometrium.

Base units: 6. Confirmed across multiple federal and state fee schedules including VA Community Care, AZICA, MassHealth, and NCDHHS.

For a laparoscopic-assisted vaginal hysterectomy (LAVH), code selection between 00944 and 00840 depends on surgical approach: use 00944 when the specimen is removed vaginally, 00840 when the primary work is abdominal or laparoscopic.

Pabau’s claims management software supports anesthesia billing workflows, helping practices submit modifier-rich claims accurately and track reimbursements across payers.

CPT code 00944: Definition and clinical description

CPT Code 00944 is the anesthesia code for vaginal hysterectomy — used when the uterus is removed through the vaginal canal under general, regional, or neuraxial anesthesia.

The code sits within the CPT section covering anesthesia for vaginal procedures, which also includes biopsies of the labia, vagina, cervix, and endometrium. Providers who bill related anesthesia codes may also reference CPT Code 00400 for anesthesia covering integumentary system procedures to understand how anesthesia base units differ across procedure categories. CPT Code 00944 is the most procedure-specific entry in that section, reserved exclusively for vaginal hysterectomy. As maintained by the American Medical Association (AMA), it is classified under HCPCS Level I and falls in the perineum anesthesia code range alongside 00940, 00942, 00948, 00950, and 00952.

In February 2020, CMS removed CPT Code 00944 from the Medicare Inpatient Only (IPO) list, meaning the procedure can now be performed and billed in outpatient settings under Medicare. Coders managing related gynecologic billing should also be familiar with CPT code 59812 for treatment of incomplete abortion, which frequently appears alongside reproductive health procedure documentation. Practices billing in hospital outpatient departments or ambulatory surgical centers should confirm that current-year OPPS rules continue to reflect this status. Teams that also handle office-based evaluations may find CPT Code 99203 for new patient office visits a useful cross-reference for understanding E/M documentation standards that affect anesthesia pre-op assessments.

Base units and reimbursement for CPT code 00944

CPT 00944 carries 6 base units. This figure is consistent across all major federal and state fee schedules reviewed. For comparison, imaging-based procedures in adjacent specialties — such as CPT code 75571 for calcium scoring CT — use entirely different RVU structures, underscoring how base unit values vary widely by procedure type., including the VA Community Care nationwide base unit table, Arizona Industrial Commission (AZICA) schedules for 2020-2021 and 2024, Massachusetts MassHealth (effective August 2021), and the North Carolina Medicaid NCDHHS schedule (effective March 2020).

Anesthesia reimbursement uses a units-based formula rather than a straight fee schedule. The calculation is:

The AZICA fee schedule lists CPT 00944 at $366.00 using a per-unit rate of $61.00, giving a useful reference point, though Medicare and Medicaid rates differ by locality. Use the CMS Physician Fee Schedule lookup to retrieve the current conversion factor for your practice’s geographic area. FastRVU provides a free 2026 RVU lookup tool updated with CMS data.

Modifiers used with CPT code 00944

Anesthesia modifier selection reflects who performed the service and the level of supervision involved. CMS and the ASA publish clear guidance on which modifier applies to each delivery model. Attaching the wrong modifier is a leading denial trigger for CPT 00944 claims. Coders working in anesthesia billing should also review CPT code 92002 for intermediate eye exams as a contrast example of how modifier rules differ across non-anesthesia specialties, helping contextualize anesthesia-specific modifier logic.

• AA: Anesthesia services performed personally by an anesthesiologist. Use when the physician administered anesthesia directly for the vaginal hysterectomy without a CRNA.
• QK: Medical direction of two, three, or four concurrent anesthesia procedures. Use when an anesthesiologist is overseeing multiple CRNAs simultaneously.
• QX: CRNA service under the medical direction of a physician. The CRNA appends QX; the supervising anesthesiologist appends QK.
• QY: Medical direction of one CRNA by an anesthesiologist. Used when the anesthesiologist directs a single CRNA for the vaginal hysterectomy.
• QZ: CRNA service without medical direction of a physician. The CRNA performs the service independently.
• AD: Medical supervision by a physician of more than four concurrent anesthesia procedures. Payment is reduced; confirm payer policy before using.
• G8: Monitored anesthesia care (MAC) for a patient with documented history making general or regional anesthesia hazardous. Attach when MAC is medically justified and documented.

Both the anesthesiologist and CRNA claims for the same case must use complementary modifier pairs (e.g., QK on the physician claim and QX on the CRNA claim). Mismatched pairs cause automatic rejections. Document supervision activity in the anesthesia record to support each modifier claimed.

00840 vs 00944: Choosing the right anesthesia code for LAVH

The most contested coding decision in vaginal hysterectomy anesthesia billing involves the laparoscopic-assisted vaginal hysterectomy (LAVH). The correct code depends entirely on surgical approach.

CPT Code 00840 covers anesthesia for intraperitoneal procedures in the lower abdomen. It applies when the primary surgical work is abdominal or laparoscopic.

CPT Code 00944 applies when the specimen is removed through the vaginal canal, even if laparoscopic assistance was used to mobilize the uterus.

According to AAPC forum guidance and the FindACode Outpatient Facility Coding Alert (October 2013), the determining factor is where the uterus exits the body. If the surgeon removed the uterus vaginally, CPT Code 00944 is the appropriate anesthesia code. If the entire procedure was conducted abdominally with no vaginal removal, 00840 applies. When in doubt, review the operative note with the surgeon before submitting.

This distinction matters for claims management software configurations too. When your system auto-populates anesthesia codes based on surgical procedure, confirm that LAVH is mapped to a human review step rather than defaulting automatically to one code. Automating the wrong mapping across high-volume LAVH cases creates systematic underpayment or denials that are expensive to correct in retrospect.

Stop losing revenue to anesthesia billing errors

Pabau's claims management tools help anesthesia and surgical practices submit accurate, modifier-complete claims from the first submission. See how it works for your team.

Book a demo

Documentation requirements for CPT code 00944

The anesthesia record must support every element of the claim: the procedure performed, the approach taken, the anesthesia type, the start and stop times, and any modifiers billed. Incomplete documentation is a common reason CPT code 00944 claims are denied or downcoded.

• Operative note confirmation: The surgical record must specify vaginal approach or vaginal specimen removal for LAVH cases. Without this, payers may default to 00840 on review.
• Anesthesia start and stop times: Document the time anesthesia care began and ended. Time units are calculated from these records.
• Pre-anesthesia evaluation: Document the pre-op assessment, ASA physical status classification, and any risk factors that affect modifier or qualifying circumstance selection.
• Intraoperative record: Vital signs, medications administered, and any complications must be contemporaneously documented.
• Post-anesthesia note: Document the patient’s status on transfer from the operating room and any post-anesthesia care provided.
• Medical necessity support: ICD-10-CM diagnosis codes must appear on the claim and correspond to the documented clinical indication for the hysterectomy.

Using digital forms for pre-anesthesia assessments reduces the risk of incomplete documentation reaching the billing team. HIPAA compliance for medical offices also requires that anesthesia records be retained securely and accessible to authorized staff for audit purposes. When documenting immunological risk factors during pre-anesthesia evaluation, coders may need to reference ICD-10 Code D84.9 for immunodeficiency, unspecified to accurately capture patient comorbidities that affect anesthesia risk classification. Practices relying on paper-based workflows often find documentation deficiencies only after a payer audit. Providers managing anesthesia for patients with complex histories may also need to reference ICD-10 Code T86.22 for heart transplant failure when documenting high-risk qualifying circumstances that justify additional anesthesia units.

ICD-10 codes commonly paired with CPT 00944

The claim for CPT Code 00944 must include an ICD-10-CM diagnosis code that establishes medical necessity for the vaginal hysterectomy. The anesthesia code alone does not convey clinical indication. Payers cross-reference the diagnosis code against the procedure to confirm the service is appropriate. For practices billing high-complexity gynecologic cases, understanding how circulatory comorbidities are coded — for example, ICD-10 Code I99.9 for unspecified circulatory system disorder — is important when documenting qualifying circumstances that affect anesthesia modifier selection.

• N80.0: Endometriosis of the uterus
• N80.1: Endometriosis of the ovary
• N81.2: Incomplete uterovaginal prolapse
• N81.3: Complete uterovaginal prolapse
• N85.00: Endometrial hyperplasia, unspecified
• D25.9: Leiomyoma of the uterus, unspecified (fibroid uterus)
• N92.0: Excessive and frequent menstruation with regular cycle
• C54.1: Malignant neoplasm of endometrium (for oncologic cases)

Code specificity matters. Using N85.00 (endometrial hyperplasia, unspecified) when the record supports a more specific code, such as N85.01 (benign endometrial hyperplasia) or N85.02 (endometrial intraepithelial neoplasia), can affect medical necessity determinations for some payers. Select the most specific ICD-10-CM code supported by the clinical documentation. Where malignancy is involved, coders should also be aware of ICD-10 Code C58 for malignant neoplasm of the placenta as a related gynecologic oncology diagnostic code. Practices expanding their knowledge of related IVF CPT codes in the reproductive health space will find that the same documentation discipline applies across this code family.

Related anesthesia CPT codes

Understanding the codes adjacent to CPT 00944 helps billing staff avoid misassignment and gives coders context for the full vaginal procedure anesthesia range. All of the following share the same parent section description: anesthesia for vaginal procedures (including biopsy of labia, vagina, cervix or endometrium).

CPT 00944 carries more base units (6) than most of its neighboring vaginal procedure codes, reflecting the complexity of a hysterectomy relative to a biopsy or endoscopy. CPT 00840 carries 7 base units, which is worth noting when the 00840 vs 00944 decision is being made for LAVH: coding to 00840 when 00944 is correct results in one extra base unit being billed, which constitutes overbilling. For verified code definitions, AAPC Codify provides a searchable CPT reference with crosswalk data. See other CPT code reference guides for related procedure areas.

Common denial reasons and how to avoid them

Practices billing CPT code 00944 encounter a predictable set of denial reasons. Catching them before submission is far more efficient than managing appeals after the fact.

• Wrong code for approach: Billing 00944 when the operative note documents a total laparoscopic hysterectomy. Review the op note before coding, not after.
• Modifier mismatch between providers: The anesthesiologist and CRNA claims for the same date and patient carry inconsistent modifier pairs. Both claims are usually denied or reduce-paid. Build a pairing verification step into your billing workflow.
• Missing or vague ICD-10-CM code: Claims submitted with unspecified diagnosis codes (e.g., N85.00 when the record supports N85.02) can trigger payer requests for additional documentation. Select the most specific code available.
• Time unit discrepancies: The billed time units do not match the start and stop times recorded in the anesthesia record. Audit billed units against source documentation quarterly.
• Outpatient IPO status confusion: Some payers or billing staff are unaware that 00944 was removed from the Medicare IPO list in 2020. Claims for outpatient vaginal hysterectomy anesthesia should not be auto-denied as inpatient-only. If denied on this basis, cite the CMS manual update (r4513cp, February 2020) in the appeal.

Using automated billing workflows to flag claims where the surgical procedure code suggests a hysterectomy but no anesthesia code is attached reduces the risk of unbundled or missing claims reaching the payer. Teams building out OB-GYN billing protocols will find additional specialty-specific coding context in the OB-GYN EMR software resources. Practices that also bill for urologic procedures should review CPT Code 51580 for cystectomy with ureterosigmoidostomy, a pelvic procedure that shares documentation complexity with vaginal hysterectomy cases.

Conclusion

Correct use of CPT Code 00944 depends on two things: confirming the vaginal approach in the operative note and matching the right modifier pair to the anesthesia delivery model. Practices tracking related ICD-10 diagnoses should note that ICD-10 Code E30.8 for other disorders of puberty and similar endocrine diagnostic codes occasionally appear in younger patients presenting for gynecologic procedures, requiring careful comorbidity documentation. Get those two elements right, and the code is straightforward. Miss either, and the claim is headed for denial or audit risk.

Pabau’s claims management software helps anesthesia and surgical practices build the verification steps that catch approach-modifier mismatches before submission, so billing staff spend less time on appeals and more time on clean claims. If your team handles a high volume of vaginal hysterectomy anesthesia cases, see how Pabau supports your workflow by booking a demo.

Continue your research

Need a software system built for OB-GYN and women’s health billing workflows? OB-GYN EMR software covers how Pabau supports women’s health practices with scheduling, documentation, and claims workflows.

Looking for documentation tools that reduce anesthesia record gaps? Digital forms explains how Pabau’s pre-anesthesia assessment forms help capture the documentation your billing team needs before the case closes.

Want a broader reference for reproductive health CPT coding? IVF CPT codes provides a full reference for fertility procedure codes in the same specialty area.

Frequently Asked Questions