G8844 HCPCS Level II Code: Apnea hypopnea index (ahi), respiratory disturbance index (rdi), or respiratory event index (rei) not documented or measured within 2 months after initial evaluation for suspected obstructive sleep…

Contextual Map

Every relationship of G8844 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Nearest codes (40)

• G8806 — Performance of trans-abdominal or trans-vaginal ultrasound and pregnancy location documented[Sibling]
• G8807 — Trans-abdominal or trans-vaginal ultrasound not performed for reasons documented by clinician (e.g., patient has a documented intrauterine pregnancy [iup])[Sibling]
• G8808 — Trans-abdominal or trans-vaginal ultrasound not performed, reason not given[Sibling]
• G8809 — Rh-immunoglobulin (rhogam) ordered[Sibling]
• G8810 — Rh-immunoglobulin (rhogam) not ordered for reasons documented by clinician (e.g., patient had prior documented receipt of rhogam within 12 weeks, patient refusal)[Sibling]
• G8811 — Documentation rh-immunoglobulin (rhogam) was not ordered, reason not given[Sibling]
• G8815 — Documented reason in the medical records for why the statin therapy was not prescribed (i.e., lower extremity bypass was for a patient with non-artherosclerotic disease)[Sibling]
• G8816 — Statin medication prescribed at discharge[Sibling]
• and 32 more

Change history

• January 1, 2012 — Added to the code set [Change history]

Sources for this page

Every coding fact on this page is read from the datasets below. Nothing is AI-generated; MedCoder-derived relationships and editorial are labelled where they appear.

Code, descriptors, coverage and pricing attributes

CMS HCPCS Alpha-Numeric (ANWEB) release — July 2026 quarterly update

Change history and date-of-service validity

CMS HCPCS quarterly update files, ingested into the change ledger

Comparisons, relationships and the contextual map MedCoder-derived

Derived by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears

All data sources and release dates

Nearest Codes in This Family

Official HCPCS Level II classifications closest to G8844 in its code family, with their registry titles.

• G8839 — Sleep apnea symptoms assessed, including presence or absence of snoring and daytime sleepiness
• G8840 — Documentation of reason(s) for not documenting an assessment of sleep symptoms (e.g., patient didn't have initial daytime sleepiness, patient visited between initial testing and initiation of therapy)
• G8841 — Sleep apnea symptoms not assessed, reason not given
• G8842 — Apnea hypopnea index (ahi), respiratory disturbance index (rdi) or respiratory event index (rei) documented or measured within 2 months after initial evaluation for suspected obstructive sleep apnea
• G8843 — Documentation of reason(s) for not measuring an apnea hypopnea index (ahi), a respiratory disturbance index (rdi), or a respiratory event index (rei) within 2 months after initial evaluation for…
• G8845 — Positive airway pressure therapy prescribed
• G8846 — Moderate or severe obstructive sleep apnea (apnea hypopnea index (ahi) or respiratory disturbance index (rdi) of 15 or greater)
• G8848 — Mild obstructive sleep apnea (apnea hypopnea index (ahi) or respiratory disturbance index (rdi) of less than 15)
• G8849 — Documentation of reason(s) for not prescribing positive airway pressure therapy (e.g., patient unable to tolerate, alternative therapies use, patient declined, financial, insurance coverage)
• G8850 — Positive airway pressure therapy not prescribed, reason not given